rm ~/.kde/share/config/knotifyrc solve this for me. Thank you Philippe for help.
** Changed in: kubuntu-meta (Ubuntu) Status: New => Fix Committed -- Can't reboot and shutdown Kubuntu KDE 4.2.98 and 4.3.00 https://bugs.launchpad.net/bugs/405522 You received this bug notification because you are a member of Kubuntu Bugs, which is subscribed to kubuntu-meta in ubuntu. -- kubuntu-bugs mailing list kubuntu-b...@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs