I seemed to have gotten farther than I thought. I've got my server set up with Ubuntu 20.04 and did all the updates.
After executing this line and entering my email as directed, it seems that it can find a package. Hopefully, someone can advise me how to overcome this obstacle:
/usr/share/jitsi-meet/scripts/install-letsencrypt-cert.sh
(I added my email address as instructed and then it got stuck here:
Bootstrapping dependencies for Debian-based OSes… (you can skip this with –no-bootstrap)
Hit:1
http://is.archive.ubuntu.com/ubuntu focal InRelease
Hit:2
http://is.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:3
http://is.archive.ubuntu.com/ubuntu focal-backports InRelease
Hit:4
http://dl.google.com/linux/chrome/deb stable InRelease
Hit:5
http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:6
https://download.jitsi.org stable/ InRelease
Reading package lists… Done
Reading package lists… Done
Building dependency tree
Reading state information… Done
Note, selecting 'python-is-python2' instead of 'python'
Note, selecting 'python-dev-is-python2' instead of 'python-dev'
Package python-virtualenv is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'python-virtualenv' has no installation candidate
I tried adding python-3, but that didn't work either.
Thanks in advance for any help.