I recently installed Ubuntu 13.10 on my laptop alongside windows 8.1. I have a Nvidia GeForce GT 645M video card on it and was having black screen on boot issues. so I installed the xorg-edgers Nvidia drivers. After this fix I could get to the login screen, however whenever I would try to log in I get blank desktop screen with no interface and a warning saying "System program problem detected Do you want to report the problem now?" and If I log in as a guest I get a desktop screen with no interface.
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If you can get to a Terminal prompt or Recovery Console,
sudo apt-get remove --purge nvidia-*
will remove the Nvidia drivers;
sudo rm /etc/X11/xorg.conf
will reset the X session settings; and
echo 'nouveau' | sudo tee -a /etc/modules
will load the default nouveau drivers to let you have a working GUI. A reboot may be required, or try service lightdm start
to get to the login screen.

douggro
- 2,537
sudo apt-get remove --purge nvidia-* sudo rm /etc/X11/xorg.conf echo 'nouveau' | sudo tee -a /etc/modules
will remove the nvidia drivers, reset the X session settings and load the defaultnouveau
drivers to let you have a working GUI. – douggro Mar 09 '14 at 23:49