Bug#1031152: system-config-printer: unlock button in system-config-printer provides no elevated permissions dialog

[Kevin Otte]

On my Debian 11 XFCE machine this works correctly. Make sure "PolicyKit 
Authentication Agent" is checked under "Session and Startup" -> 
"Application Autostart".

In Debian 12 under Sway the GNOME Authentication Agent segfaults, but I 
will take this up under separate cover. I was able to work around the 
issue for the moment by using lxpolkit for the authentication agent instead.