Comment 95 for bug 1268257

Daniel,

you could try:

1) get to a root command line interface on boot (hold down the shift key if grub doesn't normally appear)

2A) select recovery, then root login

2B) at the root command line enter:
sudo dpkg-reconfigure nvidia-331

OR

1) get to grub (hold down the shift key if grub doesn't normally appear)

2A) select recovery

2B) select failsafe X

3) then,after continuing the boot and then logging in, from a terminal issue the command:
sudo dpkg-reconfigure nvidia-331

The reconfigure incantation forces the kernel package to be rebuilt.

YMMV! If your machine still fails to reboot with a working X server, or your kitten cries, or whatever, that's your responsibility!

Good luck

R.