I just got Ubuntu the other month or so. I'm running the 11.04 version currently and trying to install drivers for a Nvidia graphics card (it's my brother's computer and he currently cannot find the number of the card right now). 

I read that, to install the proper drivers for gaming, I would need to go into "**Additional Drivers**" and choose them myself. I clicked to go into "Additional Drivers" and it searched "for available drivers", then opened the additional drivers list. Lo and Behold, there was nothing, simply the message "**No proprietary drivers are in use on this system**" and the **Help** and **Close** buttons. 

Sorry if there's some silly simple answer to all of this, I'm new to this sort of thing (used to Windows simplicity, lol) and I really don't know what to do. Help would be much appreciated.

Also, I should mention that the graphics card was installed and ran fine before switching from Windows XP to Ubuntu.