Had the same Problem, after installing the fglrx driver i got the rainbow bar in gnome. This worked for me :
sudo /usr/share/ati/fglrx-uninstall.sh # (if it exists) sudo apt-get remove --purge fglrx* sudo apt-get remove --purge xserver-xorg-video-ati xserver-xorg-video-radeon sudo apt-get install xserver-xorg-video-ati sudo apt-get install --reinstall libgl1-mesa-glx:amd64 libgl1-mesa-dri:amd64 xserver-xorg-core sudo dpkg-reconfigure xserver-xorg -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/838577 Title: GNOME Shell display problems with FGLRX To manage notifications about this bug go to: https://bugs.launchpad.net/fglrx/+bug/838577/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs