It looks line muon-notifier is the one which breaks kdialog functionality and plasma-desktop panel. File: muon-notifier.desktop Whatever it's.
Renaming /usr/share/kde4/services/kded/muon-notifier.desktop and restarting kdeinit4 solve the problem.
$ dpkg -l | grep muon-notifier ii muon-notifier 1.3.1-0ubuntu2 update notifier for KDE
It looks line muon-notifier is the one which breaks kdialog functionality and plasma-desktop panel. desktop
File: muon-notifier.
Whatever it's.
Renaming /usr/share/ kde4/services/ kded/muon- notifier. desktop
and restarting kdeinit4 solve the problem.
$ dpkg -l | grep muon-notifier
ii muon-notifier 1.3.1-0ubuntu2 update notifier for KDE