diff --git a/archive/debian-8.5-amd64.json b/archive/debian-8.5-amd64.json
index 2a3f1899e..c1266423a 100644
--- a/archive/debian-8.5-amd64.json
+++ b/archive/debian-8.5-amd64.json
@@ -5,9 +5,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -58,9 +58,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -101,9 +101,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -152,9 +152,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
diff --git a/archive/debian-8.5-i386.json b/archive/debian-8.5-i386.json
index de161a961..87897f8df 100644
--- a/archive/debian-8.5-i386.json
+++ b/archive/debian-8.5-i386.json
@@ -5,9 +5,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -58,9 +58,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -101,9 +101,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -152,9 +152,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
diff --git a/debian-7.11-amd64.json b/debian-7.11-amd64.json
index 59725180a..030d101e2 100644
--- a/debian-7.11-amd64.json
+++ b/debian-7.11-amd64.json
@@ -5,9 +5,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -57,9 +57,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -98,9 +98,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -148,9 +148,9 @@
         "<esc><wait>",
         "install <wait>",
         "preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/debian-7/preseed.cfg <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
diff --git a/debian-7.11-i386.json b/debian-7.11-i386.json
index 83eec2a14..9b1ec8389 100644
--- a/debian-7.11-i386.json
+++ b/debian-7.11-i386.json
@@ -5,9 +5,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -57,9 +57,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -98,9 +98,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -148,9 +148,9 @@
         "<esc><wait>",
         "install <wait>",
         "preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/debian-7/preseed.cfg <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
diff --git a/debian-8.6-amd64.json b/debian-8.6-amd64.json
index b641efe92..ec6480d59 100644
--- a/debian-8.6-amd64.json
+++ b/debian-8.6-amd64.json
@@ -5,9 +5,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -58,9 +58,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -101,9 +101,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -152,9 +152,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
diff --git a/debian-8.6-i386.json b/debian-8.6-i386.json
index 88c98da30..75931f857 100644
--- a/debian-8.6-i386.json
+++ b/debian-8.6-i386.json
@@ -5,9 +5,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -58,9 +58,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -101,9 +101,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
@@ -152,9 +152,9 @@
         "<esc><wait>",
         "install <wait>",
         " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `preseed_path`}} <wait>",
-        "debian-installer=en_US <wait>",
+        "debian-installer=en_US.UTF-8 <wait>",
         "auto <wait>",
-        "locale=en_US <wait>",
+        "locale=en_US.UTF-8 <wait>",
         "kbd-chooser/method=us <wait>",
         "keyboard-configuration/xkb-keymap=us <wait>",
         "netcfg/get_hostname={{ .Name }} <wait>",
diff --git a/opensuse-13.2-i386.json b/opensuse-13.2-i386.json
index 051ee3368..8c0cc510a 100644
--- a/opensuse-13.2-i386.json
+++ b/opensuse-13.2-i386.json
@@ -4,7 +4,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -46,7 +46,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -77,7 +77,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp netdevice=eth0 install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -117,7 +117,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp netdevice=eth0 install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
diff --git a/opensuse-13.2-x86_64.json b/opensuse-13.2-x86_64.json
index a7ab28574..bfbedfd8b 100644
--- a/opensuse-13.2-x86_64.json
+++ b/opensuse-13.2-x86_64.json
@@ -4,7 +4,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -46,7 +46,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -77,7 +77,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp netdevice=eth0 install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -117,7 +117,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp netdevice=eth0 install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
diff --git a/opensuse-leap-42.1-x86_64.json b/opensuse-leap-42.1-x86_64.json
index ec3a3d9c5..ffa76abb4 100644
--- a/opensuse-leap-42.1-x86_64.json
+++ b/opensuse-leap-42.1-x86_64.json
@@ -4,7 +4,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -46,7 +46,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -77,7 +77,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp netdevice=eth0 install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -117,7 +117,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netsetup=dhcp netdevice=eth0 install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
diff --git a/sles-12-sp1-x86_64.json b/sles-12-sp1-x86_64.json
index d8fdcd744..7930628e9 100644
--- a/sles-12-sp1-x86_64.json
+++ b/sles-12-sp1-x86_64.json
@@ -4,7 +4,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -46,7 +46,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -77,7 +77,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -117,7 +117,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
diff --git a/sles-12-x86_64.json b/sles-12-x86_64.json
index 48abcf7df..f20d5ac46 100644
--- a/sles-12-x86_64.json
+++ b/sles-12-x86_64.json
@@ -4,7 +4,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -46,7 +46,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -77,7 +77,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
@@ -117,7 +117,7 @@
       "boot_command": [
         "<esc><enter><wait>",
         "linux netdevice=eth0 netsetup=dhcp install=cd:/<wait>",
-        " lang=en_US autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
+        " lang=en_US.UTF-8 autoyast=http://{{ .HTTPIP }}:{{ .HTTPPort }}/{{user `autoinst_cfg`}}<wait>",
         " textmode=1<wait>",
         "<enter><wait>"
       ],
diff --git a/ubuntu-12.04-amd64.json b/ubuntu-12.04-amd64.json
index 86a86568e..509d73386 100644
--- a/ubuntu-12.04-amd64.json
+++ b/ubuntu-12.04-amd64.json
@@ -11,13 +11,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -70,13 +70,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -118,13 +118,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -175,13 +175,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
diff --git a/ubuntu-12.04-i386.json b/ubuntu-12.04-i386.json
index 4bc3e7b44..04f0889ff 100644
--- a/ubuntu-12.04-i386.json
+++ b/ubuntu-12.04-i386.json
@@ -11,13 +11,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -70,13 +70,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -118,13 +118,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -175,13 +175,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
diff --git a/ubuntu-14.04-amd64.json b/ubuntu-14.04-amd64.json
index d73149466..0c36fcc52 100644
--- a/ubuntu-14.04-amd64.json
+++ b/ubuntu-14.04-amd64.json
@@ -11,13 +11,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -70,13 +70,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -118,13 +118,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -175,13 +175,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
diff --git a/ubuntu-14.04-i386.json b/ubuntu-14.04-i386.json
index ff7e559ad..930880372 100644
--- a/ubuntu-14.04-i386.json
+++ b/ubuntu-14.04-i386.json
@@ -11,13 +11,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -70,13 +70,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -118,13 +118,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
@@ -175,13 +175,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " noapic<wait>",
diff --git a/ubuntu-15.10-amd64.json b/ubuntu-15.10-amd64.json
index 53707ffc5..f137e6559 100644
--- a/ubuntu-15.10-amd64.json
+++ b/ubuntu-15.10-amd64.json
@@ -12,13 +12,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda<wait>",
@@ -73,13 +73,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda<wait>",
@@ -124,13 +124,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda<wait>",
@@ -183,13 +183,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/vda<wait>",
diff --git a/ubuntu-15.10-i386.json b/ubuntu-15.10-i386.json
index 52c14a620..07bd12acd 100644
--- a/ubuntu-15.10-i386.json
+++ b/ubuntu-15.10-i386.json
@@ -12,13 +12,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda <wait>",
@@ -73,13 +73,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda <wait>",
@@ -124,13 +124,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda <wait>",
@@ -183,13 +183,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/vda <wait>",
diff --git a/ubuntu-16.04-amd64.json b/ubuntu-16.04-amd64.json
index 49ce36c05..3adcfc235 100644
--- a/ubuntu-16.04-amd64.json
+++ b/ubuntu-16.04-amd64.json
@@ -12,13 +12,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda<wait>",
@@ -73,13 +73,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda<wait>",
@@ -124,13 +124,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda<wait>",
@@ -183,13 +183,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/vda<wait>",
diff --git a/ubuntu-16.04-i386.json b/ubuntu-16.04-i386.json
index c40435672..74c5ef71b 100644
--- a/ubuntu-16.04-i386.json
+++ b/ubuntu-16.04-i386.json
@@ -12,13 +12,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda <wait>",
@@ -73,13 +73,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda <wait>",
@@ -124,13 +124,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/sda <wait>",
@@ -183,13 +183,13 @@
         " console-setup/layoutcode=us<wait>",
         " console-setup/modelcode=pc105<wait>",
         " debconf/frontend=noninteractive<wait>",
-        " debian-installer=en_US<wait>",
+        " debian-installer=en_US.UTF-8<wait>",
         " fb=false<wait>",
         " initrd=/install/initrd.gz<wait>",
         " kbd-chooser/method=us<wait>",
         " keyboard-configuration/layout=USA<wait>",
         " keyboard-configuration/variant=USA<wait>",
-        " locale=en_US<wait>",
+        " locale=en_US.UTF-8<wait>",
         " netcfg/get_domain=vm<wait>",
         " netcfg/get_hostname=vagrant<wait>",
         " grub-installer/bootdev=/dev/vda <wait>",