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So recently I got stuck in a login loop on Ubuntu 18. I tried some solutions posted here but none of them works for me so far. Here's what I tried by accessing terminal from login screen:

  1. Checking ownership of .Xauthority and .ICEauthority files. Even removed them. Files are fine. When I deleted them, I still got the login loop but the file were not automatically recreated when I tried to login normally. To recreate them I had to manually issue startx.
  2. Checking permissions of /tmp directory and even deleted all its content.
  3. Tried to login as a test user by creating a new user. It worked but my user does not work.
  4. Using startx when opening a terminal from the login screen works. But the login screen still stuck on a login loop if I log out or reboot.
  5. Switched to a different login screen gdm3 -­­­> lightdm by using sudo dpkg-reconfigure lightdm/gdm3 and issuing sudo init 5 to go back to login screen.
  6. Checked content of .xsession-errors and .xsessions-errors.old and got the following error messages (which I am not sure I understand):

.xsession-errors (.xsession-errors.old is exactly the same):

dbus-update-activation-environment: error: unable to connect to D-Bus: Failed to connect to socket /run/user/1002/bus: Connection refused
dbus-update-activation-environment: error: unable to connect to D-Bus: Failed to connect to socket /run/user/1002/bus: Connection refused
dbus-update-activation-environment: error: unable to connect to D-Bus: Failed to connect to socket /run/user/1002/bus: Connection refused
dbus-update-activation-environment: error: unable to connect to D-Bus: Failed to connect to socket /run/user/1002/bus: Connection refused

I looked at this bus file and did ls -la on it and this is what I got:

srw-rw-rw- 1 myusername myusername 0 Apr 11 10:02 /run/user/1002/bus

Cause of the error: I am not sure what happened as I tried to run some calculation task and I think it was hungry for too much ressources on my computer. My computer froze and I had to do a hard reboot by pressing the power button. After that, I got stuck into this loggin loop problem.

Question: Any idea what these error message means? Any idea how to solve this loggin loop issue?

EDIT:

  • Reinstalling the graphic card drivers didn't solve the problem.
  • Trying out "lubuntu-desktop" works though! I can use a regular session on this light environment. ubuntu-desktop does not work (still login loop issue).
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  • Did you find a fix? Mar 26 '20 at 17:02
  • It fixed itself eventually...
    – fgoudra
    Nov 27 '20 at 17:19
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I've run into the same issue and reinstalling lightdm fixed the issue for me:

sudo apt-get install --reinstall lightdm
sudo reboot
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I've had this happen for one user account on Ubuntu and it was caused by something screwy in the user's ~/.config directory. To quickly fix, switch to log in as the user via the console (Ctrl-Alt-F3 or similar) then at the prompt do mv ~/.config ~/config.old. Switch back to the GUI (Ctrl-Alt-F1 or similar) and you should be able to log in. Note that all config settings (background etc.) will be back to defaults.

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