[ubuntu] ATI graphics card troubles

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http://ubuntuforums.org – hi there, the ubuntu video driver is too squished and hurts my eyes. Its not very hi-def. ive tried installing envy to find a new driver, it installs but it does not show up in my system>administration menu! any suggestions on how i can improve the quality of my graphics card? I am using a Radeon HD 5750 Graphics card thanks very much x-ecutioner (Hardware)