How can I check whether my system has a driver for the graphics card installed? And if it hasn't, how can I find which one to install, through the repositories or through other sources? I got Ubuntu 12.04.
I have tried what this post suggests - I also have ATI Radeon 4500 HD card, or something like that - and I ended up still having nothing showing I do have a driver, plus my Unity 3D became Unity 2D, so I purged fglxr right away.
Any other suggestions?