Actually I didn't have unofficial packages so I'm not sure if this is the same bug (I reported it under other number but I think it got marked as dupe). In any case, the only thing I did to get X working again was:
sudo apt-get install xserver-xorg-video-all No editing of xorg.conf or anything. -- Can't calculate the upgrade with unofficial mesa/compiz packages https://launchpad.net/bugs/58424 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs