There's a workaround: Replacing /usr/bin/Xorg with the one from Debian Testing's package xserver-xorg-core makes X.org work without further changes to any other file.
-- Fatal crash on X startup on Ultra 10 https://launchpad.net/bugs/56427 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
