Bug#948195: nvidia-legacy-340xx-driver: Xorg fails to start with a kernel panic after the upgrade to 340.108-1

[KeyofBlueS]

Yes I'm on unstable. I upgraded on December 31th but I waited a few days to
check that the problem just wasn't on my side.
I labeled it as important because it seemed right to me (it doesn't cause
data loss or introduces a security hole ecc...).
Among the various tests that I did, I disabled lightdm too and it can be
enabled again with "dpkg-reconfigure lightdm".
I made that script because I needed to easly switch between 340.107-8 and
340.108-1 for troubleshooting.