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Possible Duplicate:
What should I do when Ubuntu freezes?
How do I reset GNOME to the defaults?

Upgrade from 11.04 to 11.10 failed. Reinstalled 11.10 without formatting. Appears that config files in /home are breaking Unity (because it runs fine from a live CD). Cannot run 'unity --reset' as the graphics corrupt, the mouse freezes and it appears the keyboard is frozen as well. How can I repair this from recovery mode?

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marked as duplicate by Jorge Castro, stephenmyall, Mitch, Eliah Kagan, RobotHumans Sep 3 '12 at 21:32

This question was marked as an exact duplicate of an existing question.

2  
You might want to try this.. - askubuntu.com/questions/56313/… – James Jan 7 '12 at 14:50
    
@JorgeCastro Might it be wise to have a separate canonical question for "unable to login"? While this post calls it "freezing", I think it's a different sort of problem (eg calls for revert configs rather than TTYs and REISUB). And most people I do not think would search for it with that set of words. – Jjed Sep 3 '12 at 18:33

I had the same problem. I solved it by doing similar steps to the comment by @jrg. If you are wary of deleting too many things, you can try deleting some of the Gnome settings files at a time.

  • When light-dm seems to freeze on log-in, you can hit ctrl + alt + F1, log in, and run the commands from @jrg's comment (Reset Gnome)
  • Then run:

    sudo killall light-dm
    sudo light-dm
  • And log back in.

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