how do I use NVIDIA X driver?
I'm running ubuntu 9.04 and have nvidia 7300 gt card, I also downloaded some drivers for it from the add/remove category, but i guess my card doesn't work properly because when i tried to set up screen saver most didn't work and when i go to system,preferences,display it says that "it appears my graphix driver doesn't support the necessary extensions to use this tool. Do you want to use your graphics driver vendor's rule instead? I click yes and then it says "You do not appear to be using the NVIDIA X driver. Please edit your X configuration file (just run `nvidia-xconfig` as root), and restart the X server." I can't do that because when I enter 'sudo nvidia-xconfig' nothing happens. What should I do?