Comment 3 for bug 949330

Looks like it isn't finding the kernel nvidia driver. Guess when you upgraded it updated the kernel but for whatever reason didn't rebuild the nvidia driver. Probably if you go into grub and boot an earlier kernel it'd work.

Try `sudo apt-get purge nvidia-*` and then reinstalling nvidia-current via jockey. That should force it to rebuild against the current kernel.

It would be interesting to see a make.log or something to see why the kernel module didn't get built. Have you manually installed kernels during this timeframe?