After a complete restart of the computer it now works. I had restarted the X-server after the upgrade, but that was not enough, a complete reboot was required.
-- In Dapper Kpilot cannot contact kpilotdaemon or display configuration https://launchpad.net/bugs/48356 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs