In bug #68267, I suggest a possible fix to x11-common. Mainly, to replace: if [ $? -ne 2 ]; then by: if [ $? -eq 1 ]; then in validate_nice_value () of the config script.
-- Wrong nice value while upgrading debconf https://launchpad.net/bugs/85979 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs