I restarted a frozen Ubuntu 16.04.1 session using Alt + PrtSc + REISUB and now the graphical login manager does not show and I cannot log in. The following message briefly displayed and then disappears in an ongoing cycle.
/dev/sda1: Clearing orphaned inode 12976130 (uid=0, gid=0, mode0100600, size=334)
/dev/sda1: clean, 959550/14221312 files, 50959728/56878080 blocks
[ OK ] Stopped LSB: Start NTP daemon.
[ OK ] Created slice User Slice of gdm.
Starting User Manager for UID 115...
[ OK ] Started Session c2 of user gdm.
[ OK ] Started User Manager for UID 115.
Starting LSB: Start NTP daemon...
Stopping User Manager for UID 115...
[ OK ] Started LSB: start Samba daemons for the AD DC.
[ OK ] Stopped User Manager for UID 115.
I managed to log in using Ctrl + Alt + F1, however after a few seconds, the screen flashes black, and continues displaying the message above in the same manner. I can press Ctrl + Alt + F1 and the login is still active.
I've tried restarting it a few times using the power button with no success.
How can this be resolved? I still have access to recovery mode.
Try holding Alt+Ctrl+F2 It seems to do that randomly sometimes. It could be due to a late start of gdm, but I'm not certain as I don't know what each application does exactly. I do know that my graphical interface disappeared as well and went to that same screen, but the interface was still on tty2, so I just switched back over to it as simply as the above method.
I solved this problem by booting in safe mode, then checking how much free space I had at the shell prompt using
df -h.The amount available was ZERO.
Removed the docker images and everything turned back to normal