Ati drivers on Lubuntu

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http://ubuntuforums.org – So I just got an invite for the steam beta. I switched to Lubuntu about a month ago and I have made it my default version. I ended up reinstalling the thing from scratch and now I don't have any other GUI on my linux installation. So I was wondering how do I install the ati drivers on Lubuntu. I know they're not working since even Chromiun (the open source rail shooter game) doesn't run well on the thing. I have an Ati 4890 on my PC and I used to use the restricted drivers options in the regular ubuntu. But that window is nowhere to be found on Lubuntu and the documentation on lubuntu.net does (Hardware)