Problems with the Display and Graphics Cards
Recently, Ubuntu has been doing an excellent job of detecting graphics cards, so it's unlikely that you'll ever be left staring at a blank screen. Things aren't guaranteed to turn out perfect, however. This section covers such problems as getting 3D acceleration support (if it's missing) and adjusting your screen resolution (if it's looking weird). Just in case, there's something to help you with a dreaded blank screen too.
Games/Compiz Don't Work: Installing Accelerated Graphics Drivers
If you can't get Compiz or a certain game to work, you might need to install some accelerated graphics drivers. This is because only basic drivers (which can't handle fancy effects and 3D games) are installed for some ...