LXC Ubuntu LTS stopped working

I am actually just battling more critical issue with the Omnia right now: Update to 3.11.2 broke my DHCP
(it might be connected?)

this is the output:

root@turris:~# lxc-attach -n ubuntu -- systemctl status sshd.service

● ssh.service - OpenBSD Secure Shell server
   Loaded: loaded (/lib/systemd/system/ssh.service; enabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Wed 2019-03-20 23:09:17 CET; 3min 4s ago
  Process: 155 ExecStart=/usr/sbin/sshd -D $SSHD_OPTS (code=exited, status=255)
  Process: 144 ExecStartPre=/usr/sbin/sshd -t (code=exited, status=0/SUCCESS)
 Main PID: 155 (code=exited, status=255)
   CGroup: /system.slice/ssh.service

Mar 20 23:09:17 ubuntu systemd[1]: Starting OpenBSD Secure Shell server...
Mar 20 23:09:17 ubuntu systemd[1]: ssh.service: Main process exited, code=exited, status=255/n/a
Mar 20 23:09:17 ubuntu systemd[1]: ssh.service: Failed with result 'exit-code'.
Mar 20 23:09:17 ubuntu systemd[1]: Failed to start OpenBSD Secure Shell server.