After upgrading from Ubuntu 15.10 to 16.04 via do-release-upgrade
I can now only boot into TTY mode. The boot log shows:
[FAILED] Failed to start Simple Desktop Display Manager.
See 'systemctl status sddm.service' for details.
Looking following the suggestion for more details I see:
sddm.service - Simple Desktop Display Manager
Loaded: loaded (/lib/systemd/system/sddm.service; enabled; vendor preset: enabled)
Active: inactive (dead) (Result: exit-code) since Tue 2016-05-24 18:35:01 CEST; 4min 58s ago
Docs: man:sddm(1)
man:sddm.conf(5)
Process: 1801 ExecStartPre=/bin/sh -c [ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/bin/sddm" ] (code=exited, status=1/FAILURE)
May 24 18:35:00 miked-Ubuntu systemd[1]: sddm.service: Failed with result 'exit-code'.
May 24 18:35:01 miked-Ubuntu systemd[1]: sddm.service: Service hold-off time over, scheduling restart.
May 24 18:35:01 miked-Ubuntu systemd[1]: Stopped Simple Desktop Display Manager.
May 24 18:35:01 miked-Ubuntu systemd[1]: sddm.service: Start request repeated too quickly.
May 24 18:35:01 miked-Ubuntu systemd[1]: Failed to start Simple Desktop Display Manager.
Once I am in TTY I can start the desktop with: sudo service lightdm start
and everything appears to be fine.
Any suggestions on how I might resolve this?
Thanks
Update:
I'm running this on a 13" Macbook Pro Retina