In case you are sitting at home and spend a lot of time calling other people like me: You might want to look into #jitsi meet. (https://meet.jit.si/) It is really simple to use and doesn't need accounts or desktop clients.
And in case the servers get overloaded in the next weeks, you can simply host it yourself. I wrote a quick guide that sums up how to get everything running:
https://guides.lw1.at/books/how-to-install-jitsi-meet-on-debian-or-ubuntu
I just tried out your tutorial, very nice, simple, works.
The only thing that was slightly unclear was, when going from the "Run the installer" step to "the next chapter" (in red), it actually skips the section "Some more things" (which I needed, because NAT).
Otherwise 10/10 would, and will, recommend.
Thanks Lukas !
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