Most of the time when I log in, I after I enter my password, it says login in, and nothing else happens.
closed as off topic by fossfreedom♦ May 22 '12 at 18:38
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I experienced the same problem after several updates were installed this morning. To avoid more frustration, the solution I found was to install gdm and use it as my display manager.
It might not be the definitive solution, but I'm providing this as an answer because I don't have enough reputation to comment on a question.
I have the same problem and found out, that there is already a confirmed bug reported on launchpad for this problem: https://bugs.launchpad.net/lightdm/+bug/986967
I wrote a question for this problem on askubuntu myself with a bunch of log output ... LightDM hangs at login - Error MSG in auth.log - what can I do?
maybe it's an authentication problem, because when I can login, this line in auth.log is present:
and when I have the problem, this line isn't there...
(I somehow can't comment so I wrote an answer... I hope that isn't rude or something)
edit: There is an unofficial bugfix posted in launchpad. I didn't try it yet.
edit: People in Launchpad report that the bugfix is working, and that the problem may be caused by deactivating the login sound with Ubuntu Tweak. Maybe reactivating the login sound might fix this problem too until a official update is available
I noticed the same problem too, several times. When the login screen hangs up, I switch to command line (CTRL+ALT+F1) and simply stop and start LightDM again. Annoying problem, for the moment I think I'll try this way, until the problem is fixed.