[ubuntu] Problem with Ubuntu GUI

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http://ubuntuforums.org – Hi all, I bought a HP Pavilion G6 with Windows 8 on it about a week and a half ago, and I wanted to try to install ubuntu on the system. After much trouble, I did get ubuntu on the system and I can boot into it. However, after I log in there is no GUI and I have not been able to solve this problem. When I first installed Ubuntu, the operating system worked fine except the screen would constantly flicker. When I updated my video card, restarted, and logged in there was no longer a GUI. All of the folders on the desktop disappeared, there was no sidebar, and there was no top panel th (Hardware)