Comment 35 for bug 1032672

@34 This is an issue with "legacy" (HD2000-4000) cards being unsupported by the latest Catalyst/fglrx releases. Those cards need the "legacy" release drivers which at the moment are based on Catalyst 12.6. Unfortunately these also don't support xserver 1.13.

I've filed a separate bug for this: https://bugs.launchpad.net/ubuntu/+source/fglrx-installer/+bug/1058040