I've recently upgraded my ubuntu to 14.10 and problem also occurred.
I've removed bumblebee and primus (just remove not purge) and it didn't help.
Downgrading ubuntu-drivers-common to 0.2.91.4 also failed.
But I've found out that my X.org is complaining about missing nvidia module, and indeed there was no such file in /usr/lib/xorg/modules/drivers. Re-installing nvidia-331 did not helped. So I simply copied nvidia_drv.so to drivers and libglx* to /usr/lib and it now works! Although it lacks hardware acceleration but I'm able to finish my work for now.
Maybe somebody will guide me - which package is responsible for linking appropriate nvidia_drv.so to X.org modules?
I've recently upgraded my ubuntu to 14.10 and problem also occurred.
I've removed bumblebee and primus (just remove not purge) and it didn't help. drivers- common to 0.2.91.4 also failed.
Downgrading ubuntu-
But I've found out that my X.org is complaining about missing nvidia module, and indeed there was no such file in /usr/lib/ xorg/modules/ drivers. Re-installing nvidia-331 did not helped. So I simply copied nvidia_drv.so to drivers and libglx* to /usr/lib and it now works! Although it lacks hardware acceleration but I'm able to finish my work for now.
Maybe somebody will guide me - which package is responsible for linking appropriate nvidia_drv.so to X.org modules?