The Ubuntu 10.10 on my MBP 6.2 had black screen problem.

I upgraded to Ubuntu 12.04 on my MBP6.2. After installation, everything works fine before I update nvidia driver. When I update nvidia driver following these commands (This is one of solutions I found in askubuntu):

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

I notice many people have similar problems. Does anyone show me a real work solution for my case? Thank you very much!