test.json

{
    "builders": [
        {
            "boot_command": [
                "<esc><wait>",
                "<esc><wait>",
                "<enter><wait>",
                "/install/vmlinuz<wait>",
                " auto<wait>",
                " console-setup/ask_detect=false<wait>",
                " console-setup/layoutcode=us<wait>",
                " console-setup/modelcode=pc105<wait>",
                " debconf/frontend=noninteractive<wait>",
                " debian-installer=en_US<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>",
                " netcfg/get_domain=vm<wait>",
                " netcfg/get_hostname=vagrant<wait>",
                " grub-installer/bootdev=/dev/sda<wait>",
                " noapic<wait>",
                " preseed/url=http://{{ .HTTPIP }}:{{ .HTTPPort }}/preseed-vb.cfg<wait>",
                " -- <wait>",
                "<enter><wait>"
            ],
            "guest_additions_path": "VBoxGuestAdditions_{{.Version}}.iso",
            "guest_os_type": "Ubuntu_64",
            "headless": true,
            "http_directory": "http",
            "iso_checksum": "a5b0ea5918f850124f3d72ef4b85bda82f0fcd02ec721be19c1a6952791c8ee8",
            "iso_checksum_type": "sha256",
            "iso_url": "iso/ubuntu-18.04.1-server-amd64.iso",
            "shutdown_command": "echo 'vagrant' |sudo -S shutdown -P now",
            "ssh_password": "vagrant",
            "ssh_port": 22,
            "ssh_username": "vagrant",
            "ssh_wait_timeout": "1000s",
            "type": "virtualbox-iso",
            "vboxmanage": [
                [
                    "modifyvm",
                    "{{ .Name }}",
                    "--memory",
                    1024
                ],
                [
                    "modifyvm",
                    "{{ .Name }}",
                    "--cpus",
                    2
                ]
            ],
            "vm_name": "ubuntu-server-18.04-v0.1-v0.1"
        }
    ],
    "post-processors": [
        {
            "output": "build/{{.Provider}}-ubuntu-server-18.04-v0.1-v0.1.box",
            "type": "vagrant"
        }
    ]
}