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sudo apt-get -y remove --purge xorg-driver-fglrx fglrx* --force-yes

sudo apt-get -y install --reinstall libgl1-mesa-glx libgl1-mesa-dri fglrx-modaliases --force-yes

sudo dpkg-reconfigure xserver-xorg

sudo apt-get -y install --reinstall xserver-xorg-core --force-yes

sudo apt-get -y install --reinstall xserver-xorg-video-radeon

sudo rm /etc/X11/xorg.conf

sudo reboot