On Sat, Dec 18, 2010 at 9:21 PM, arne anka <debian@ginguppin.de> wrote: > interesting -- at least the "Apply" button becomes active after a change ... > but hitting "Apply" returns only: > > Unable to authenticate/execute the action: (code 4) Do you have polkit-kde-1 installed? If not, try installing it, logout/login and try again.