[ubuntu] Installing drivers for AMD E-450 in 12.04.1 LTS

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http://ubuntuforums.org – I recently installed Ubuntu 12.04.1 LTS on an HP Pavilion dm1z, and I need some help finding the right driver/configuration for its AMD E-450 APU. The default VESA Wrangler works adequately for light use, but chokes pretty badly on any sort of flash/high def video. I tried enabling fglrx via the Additional Drivers menu, but then the system performs unbearably slowly. There is also an option for fglrx with (post-release updates), but it fails to install and also deactivates fglrx. (Hardware)