[ubuntu] Ubuntu Graphics work on Live, but not installation.

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http://ubuntuforums.org – So, the advanced graphics on my install do not work correctly with my ATI Radeon graphics card because whenever I enable the restricted drivers, the whole operating system stops working. I have accepted this. However, when I boot to an Ubuntu Live CD, the full graphics work fine. Why does a Live CD, with no special drivers, work fine, but actually installing the operating system make it work less? This makes no sense at all? Anyone else ever have this problem? (Hardware)