I have a pre 12.04LTS Kubuntu system I've upgrade to 12.04LTS and now to 14.04LTS. I remember the unable to logout, shutdown etc from 12.04 and the solution that worked then and now for me on 14.04LTS was:
sudo apt-get install --reinstall polkit-kde-1
and then reboot.
I have a pre 12.04LTS Kubuntu system I've upgrade to 12.04LTS and now to 14.04LTS. I remember the unable to logout, shutdown etc from 12.04 and the solution that worked then and now for me on 14.04LTS was:
sudo apt-get install --reinstall polkit-kde-1
and then reboot.