I am stuck with a black screen when booting 14.04. I can log in via CLI but cannot start the GUI. I have tried the standard fixes to no avail. I have tried installing lightdm, and removing and changing permissions of .Xauthority but this made no difference.
/var/log/Xorg.0.log contains the following errors:
[ 327.953] (EE) [drm] KMS not enabled
[ 327.970] (EE) Screen 0 deleted because of no matching config section.
[ 327.987] (EE) FBDEV(0): FBIOBLANK: Invalid argument
[ 328.035] (EE) Failed to initialize GLX extension (Compatible NVIDIA X driver not found)
[ 328.263] (EE) FBDEV(0): FBIOBLANK: Invalid argument