Sorry, forgot to answer to the other question. No, there are no files owned by vnc in /etc/polkit-1/rules.d. alpha:~ # ls -l /etc/polkit-1/rules.d total 44 -rw-r--r-- 1 root root 321 Sep 16 13:38 50-default.rules -rw-r--r-- 1 root root 38205 Nov 19 08:22 90-default-privs.rules