NVidia and Ubuntu / Mint crash

Recently, I've re-install my desktop with ubuntu 12.10 , 12.05 and also with Mint 14.1.
But it didn't work ... The installation, for all the OS, was very smooth and intuitive.
But the system was unstable and one of the symptom was that my Firefox did crash and caused a crash of my login session each time I tried to start it (it happened on ubuntu 12.10 and on mint 14.1)

After some google search, I think the reason was of the NVidia graphic driver , which was badly buggy.

I've re-install it using these instructions found here http://askubuntu.com/questions/192025/ubuntu-12-04-terminal-only-after-nvidia-driver-upgrade

• Remove all the nVidia drivers that you installed.

sudo apt-get --purge remove nvidia-*

• Install the drivers again:

sudo add-apt-repository ppa:ubuntu-x-swat/x-updates
sudo apt-get update
sudo apt-get install nvidia-current nvidia-settings

On my Mint 14.1 at least, it helped. I don't know yet about ubuntu ...