I have the same bug. Tried a few things documented here: http://ubuntuforums.org/showthread.php?p=1638020#post1638020 but still same error.
** Attachment added: "main.log" http://librarian.launchpad.net/4893131/main.log -- Can't calculate the upgrade with unofficial mesa/compiz packages https://launchpad.net/bugs/58424 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
