My OS (resembling Ubuntu 12) is having a graphical issue. An app
"ATI binary X.Org driver" when not installed makes the graphics very laggy and slow; while I can take screenshots. When installed, there are a few glitches in minimized windows and I can't take screen shots. It is also always showing the same background. I have
ATI Radeon HD7770 graphics card.
Please help me resolve this issue.