I guess the proprietary fglrx driver has not been completely removed.
See https://help.ubuntu.com/community/RadeonDriver#head-
229f59879c2a2b6c6635d1e189706d97f836b879

Try:
 dpkg -l '*fglrx*'
and
 locate fglrx
to see if there is still some evil proprietary bits around.

It looks like a mismatch between files that usually are provided by 
libgl1-mesa-glx and libgl1-mesa-dri. Try:
 apt-get install --reinstall libgl1-mesa-glx libgl1-mesa-dri


** Changed in: xserver-xorg-video-ati (Ubuntu)
     Assignee: (unassigned) => Tormod Volden (tormodvolden)
       Status: New => Incomplete

-- 
ati opensource driver - no direct rendering
https://bugs.launchpad.net/bugs/153511
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