This may be a KSM problem, can you try too add 'radeon.modeset=0' to the kernel line in grub.
** Package changed: ubuntu => xserver-xorg-video-ati (Ubuntu) -- Ubuntu Lucid doesn't start after installing https://bugs.launchpad.net/bugs/563811 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs