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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.

Greg
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  • press ctrl-at-f7 and login in graphical session. the messeges shown are not error messages btw – Anwar Aug 10 '16 at 03:42
  • Nothing happens when pressing Ctrl + Alt + F7. No response at all. The graphical login manager is not displayed at any time. – Greg Aug 10 '16 at 03:45
  • what display managers do you have? if you aren't sure, which tell me have you installed other DE? – Anwar Aug 10 '16 at 04:10
  • Just noticed that Ctrl + Alt + F1 stays logged in, even after the screen flashes the message (I have to press Ctrl + Alt + F1 to get back to the logged in session). Upon running cat /etc/X11/default-display-manager the following is displayed: /usr/sbin/gdm3. – Greg Aug 10 '16 at 04:20
  • aha! It seems you installed gnome-shell on top of Ubuntu. I experienced this same problem with gdm3. please use sudo dpkg-reconfigure gdm3 and if it shows you a list of several display managers, select one lightdm using arrow key and hit enter. Then reboot. Let me know if that helps – Anwar Aug 10 '16 at 04:37
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    I am running the Gnome variant of Ubuntu. After executing sudo /etc/init.d/gdm3 stop the screen flashing stopped. I tried running sudo dpkg-reconfigure gdm3 and selecting lightdm and upon reboot the login manager is displayed. After trying to login the screen freezes, then briefly turns off and returns back to the original login screen. I also tried apt-get remove --purge nvidia*, apt-get remove --purge gdm3 gnome gnome-shell then apt-get autoclean, apt-get autoremove and rebooted. After that I reinstalled gdm3, gnome and gnome-shell and rebooted again. The problems remain. – Greg Aug 10 '16 at 05:25
  • Just tried reinstalling gnome desktop and xorg and per the linked instructions and still no success: http://askubuntu.com/questions/760934/graphics-issues-after-installing-ubuntu-16-04-with-nvidia-graphics. – Greg Aug 10 '16 at 05:55
  • have you tried installing lightdm instead as the display manager? install it and select it as default – Anwar Aug 10 '16 at 05:56
  • Still no still. May have to reinstall clean after all... – Greg Aug 10 '16 at 07:36

2 Answers2

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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.

Erick Couts II
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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

Benjamin R
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user3180448
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