For those of you bothered by the deluge of annoying popups asking to authenticate pretty much every move one makes in Focal Fossa ("System policy prevents this and that" when mucking about in WiFi Settings, "Authentication needed to refresh system repositories" etc.), a partial answer is here: https://c-nergy.be/blog/?p=14051.
Apparently this is due to manually installing the xRDP package in Ubuntu.
Now, if only someone could post the fix for getting rid of network and WiFi-related "Authorization Required" messages, that'd be swell! I am guessing it'd have to be another .pkla file in /etc/polkit-1/localauthority/50-local.d