[ubuntu] How to use VGA over ATI graphics card

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http://ubuntuforums.org – Hi I hope someone can help me with this. I have lappy with propriety ATI card on. When i used the live ubuntu cd (9.04) the graphics works perfectly for my use. After I installed i get funny anomilies on right hand side of my screen especially when moving programs around. i.e. moving open window over another. How do i get the same generic driver as the live cd to work on muy installation ? Please keep it simple my use of linux is limited. Kind regards and thanks in advance L (Hardware)