Since PolicyKit was updated in 12.3 the information in the [OpenSUSE Docu Chapter 6.1.1.2][] is outdated. The polkit-auth command and /etc/PolicyKit/PolicyKit.conf do not exist any more. I tried to set the policy for org.libvirt.unix.manage via the KDE control center but this did not work. In the end I had to edit /etc/polkit-default-privs.local to contain: org.libvirt.unix.monitor yesorg.libvirt.unix.manage yes