[ubuntu] How to undo this install...

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http://ubuntuforums.org – I have been trying to get haloce to work on ubuntu for over a year now, and I decided to take a crack at installing the ATI driver tonight. On a whim I followed this video: http://www.youtube.com/watch?v=52JRCddtZLk It got up to the amd config and said It could not find any compatible adapters. (I have "Advanced Micro Devices [AMD] nee ATI M56GL [Mobility FireGL V5200]", what gives?) Anyway Whatever I did has made the interface look a bit different, and now halo crashes on startup instead of being nearly impossible to see like it used to. No drivers show u pin the system settings&g (Hardware)