[ubuntu] Very sluggish video with Radeon HD6870

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http://ubuntuforums.org – I have had very sluggish video with my HD6870 during the early alpha stages and it has continued up until today. Is this a relic of broken upgrades from early alphas or does the current radeon driver not work well with this card? I also don't see an option in Ubuntu to install the proprietary driver. Normal or is my old system just jacked up? (Hardware)