[ubuntu] fglrx-updates held back

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http://ubuntuforums.org – Hi I just upgraded through the update manager but i cannot reach the desktop. Apt says the package fglrx-updates has been held back. How do i fall back to the free Radeon driver? I found that fglrx cannot be installed since it depends on a package 'xorg-video-abi-11' but it has no installation candidate. Iam on 64 bit. thanks (Hardware)