Hey guys after installing ubuntu 12.04 I faced several problems with My Graphics card. Folowing this question: I was able to install my Catalyst and everything seems OK. The only problem I have is Chrome. Facebook, Youtube and maybe other sites are messed up.. I checked this question too but, I have already installed the correct drivers.
A temporary workaround that worked for me is to disable the PepperFlash plugin in Google Chrome.
After this, all of my Facebook and YouTube rendering issues disappeared. But I would keep checking the question you mentioned, and keep your graphics card driver updated.