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I had a same problem: upgrade from 12.04 to 12.10 and then to 13.04. Unity was broken and only reseting unity dconf reset -f /org/compiz/ setsid unity wasn't help. I tried to do what hafichuk explained above: sudo apt-get purge fglrx lightdm && sudo apt-get install lightdm ubuntu-desktop and then dconf reset -f /org/compiz/ setsid unity and ...
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