[130s-rpi2] Can't log on to Ubuntu

[130s]

After #327 (comment), CLI shows briefly login prompt but then shifts to informational page and never let me type in.

From ssh, I don't know the password.

[130s]

Using ssh private key worked (ref: how to add multiple ssh private keys)

$ ssh-add /XXXXX/id_rsa_YYYYY
Enter passphrase for /XXXXX/id_rsa_YYYYY:
Identity added: /XXXXX/id_rsa_YYYYY (/XXXXX/id_rsa_YYYYY)
$ ssh -X myaccount_ubuntucore@ipaddr
X11 forwarding request failed on channel 0
Welcome to Ubuntu Core 16 (GNU/Linux 4.4.0-1092-raspi2 armv7l)

The programs included with the Ubuntu system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Ubuntu comes with ABSOLUTELY NO WARRANTY, to the extent permitted by
applicable law.

 * Ubuntu Core:     https://www.ubuntu.com/core
 * Community:       https://forum.snapcraft.io
 * Snaps:           https://snapcraft.io

This Ubuntu Core machine is a tiny, transactional edition of Ubuntu,
designed for appliances, firmware and fixed-function VMs.

If all the software you care about is available as snaps, you are in
the right place. If not, you will be more comfortable with classic
deb-based Ubuntu Server or Desktop, where you can mix snaps with
traditional debs. It's a brave new world here in Ubuntu Core!

Please see 'snap --help' for app installation and updates.
myaccount_ubuntucore@localhost:~$