There is a possible configuration fix for this. Install policykit-1-gnome. Ensure 'PolicyKit Authentication agent' is checked in 'Application Autostart' in 'Session and Startup'. Logout and log back in to xfce4 session.
pkexec apps now launch OK. -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org