[ubuntu] Ati Radeon x1200 series video card?

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http://ubuntuforums.org – I want to install the open source one from ubuntu. but I don't know how! I was reading a guide but it didnt make ANY bit of since.. what is the easiest, quickest way to install this open-source driver? I need it to watch youtube and play flash games (oh and compiz fusion!). Thanks. EDIT: IT DOES NOT SHOW UP UNDER HARDWARE DRIVERS IN THE ADMINISTRATION PANEL. Thanks again! (Hardware)