(on Mon, 2020-11-30 at 23:56 +0000, Ed wrote)
I thought you said your system was "quiet"?
For your "network activity" issue the lines of interest are those
which include "ESTABLISHED" as the state.
It shows both "thunderbird" and "firefox" are both running and
connected
to hosts. So, one would expect some network activity
When I opened the thread this morning (hours ago), my system was quiet.
When, several minutes ago, I did the netstat -atuevp whose output I
attached to my reply to you and Tim, yes, Thunderbird and Firefox were
running.
Shall I reboot and re-do the netstat before launching Thunderbird and
Firefox?
I will dig into the user-guide you referenced. This will take time.