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[samuel <441586@xxxxxxxxxxxxxxxxxx>]

This happens to me on a desktop computer after I botched an install of some nvidia drivers. I am unable to run unity, It just displays the kernel messages it usually does when logging me out the shows me the login screen, the same thing happens if I run /usr/lib/nux/unity_support_test -p after logging into a 2d session that runs metacity. When I try and run compiz --replace from the 2d session I my desktop flips and window decoration goes very strange (the exit minimise and close buttons go the side for instance). I am pretty certain it's a driver issue and I am going to try doing this:
switch to a terminal using ctr+alt+f1
stop x: /etc/init.d/lightdm stop
uninstalling the nvidia drivers using nvidia-installer --uninstall
remove any leftovers: apt-get purge nvidia*
reinstall mesa and x apt-get install --reinstall xserver-xorg-core xserver-xorg-core libgl1-mesa-glx libgl1-mesa-dri
restart the computer: reboot

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