I have been using xubuntu on my portege m200 since version 11.10 with support for the internal nVIDIA GeForce graphics card without any porblems.
But after the last major update there is no more hardware support for the nVIDIA card. The GUI tool for proprietary drivers states that there ist some driver, but it is not active.
The question is: what is the correct package to get the card running? And why did you remove the support for this card from version to version!?