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The login and Unity Greeter is working. However, if I try to log-in - in a matter of seconds, it would return to the login screen.
This happened when I tried to install a package and I restarted my computer.

I also tried to uninstall, install, re-install, upgrade the lightdm, gdm and gnome.

I installed/reinstalled Ubuntu Desktop/Cinnamon/Gnome3 as well, to try and see if it would work. But it is still the same and I can see the login-lockscreen.

In a matter of seconds, I'll be back to the log-in screen.

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Does opening a guest session work? – Béné Dec 25 '12 at 11:18
"This happened when I tried to install a package" - What package did you install? – gertvdijk Dec 25 '12 at 12:02

1 Answer

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At the login screen, use ctrl-alt-f1 to get to a tty login. Login, then delete ~/.Xauthority . If the X server did not shut down properly during the crash, the orphaned lock file is preventing you from starting X.

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