I have a laptop with a Nvidia 250M and Xubuntu 12.04 LTS, I have installed Cuda 5.5 following this guide.
I have a doubt. I have four drivers in "Additional Driver" but no one is marked as active and under the "NVIDIA X Server Setting" I read that I have installed the 319.37.
Following this guide I have run the following in a terminal:
The terminal response was that the config file was missing and it would be created a new one. After this I rebooted the PC but my doubt still remains, am I using the driver or have I only installed them?