You still have the fglrx driver installed. It won't work right until you remove it. Post th output you get whyen you run these commands:
sudo apt-get purge fglrx-updates sudo apt-get install --reinstall libgl1-mesa-glx xserver-xorg-core -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1129872 Title: Could not find video drivers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1129872/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp