I guess the proprietary fglrx driver has not been completely removed.
See https://help.ubuntu.com/community/RadeonDriver#head-
229f59879c2a2b6c6635d1e189706d97f836b879
** Changed in: xserver-xorg-video-ati (Ubuntu)
Assignee: (unassigned) => Tormod Volden (tormodvolden)
Status: New => Incomplete
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[gutsy][beta] Cannot get accelerated video, radeon 9200
https://bugs.launchpad.net/bugs/146900
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