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##This is how I solved the desktop break on upgrade with ATI gpu using fglrx driver

 

sudo -s

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

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

dpkg-reconfigure xserver-xorg

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

reboot

sudo apt-get install fglrx #on reentry

reboot