1. Open the Synaptic Package manger
2. Search nvidia
3. Install all the 173 who have not yet been installed but has a suffix ‘dev’ or
4. Type in the terminal command ’sudo apt-get install nvidia-GLX-173′
5. Make sure also installed nvidia settings
6. Restart back
7. click system -> administration trus select ‘Hardware Drivers ”
8. Switch 173
9. Type the command in the terminal ‘gksudo nvidia-settings’

you next restart your computer to gnome …