Finally, after more than 12 hours and around 10 times re-installing Ubuntu, i got to install the ATI Drivers. Whatever, what are the latest ATI Driver version & Catalyst Center?
Under software it says:
-Driver Packaging Version: 9.00.11-120920a-147436C-ATI -2D Driver Version: 9.0.2 -Catalyst Cotnrol Center Version: 2.17 -RandR Version: 1.3
Then OpenGL: -OpenGL Provider: Advanced Micro Devices, Inc. -OpenGL Renderer: AMD Radeon HD 7770 Series -OpenGL Version: 4.2.11903 Compatibility Profile Context
But actually latest version is "13.1", here it says "2.17". Though i do know that Ubuntu doesn't provide the latest version until it's not fully functional.
On "Additional Drivers" the selected one says: "Using Video driver for the AMD graphics accelerators from fglrx (proprietary).