Hi Glen-and-All: I agree with Jude, you may be missing repos. I could paste in
my apt-sources list from Debian SID
deb [arch=amd64,i386] http://ftp.us.debian.org/debian sid main contrib non-free
# deb http://ftp.us.debian.org/debian sid-updates main
deb [arch=amd64] https://download.docker.com/linux/debian buster stable
# deb-src [arch=amd64] https://download.docker.com/linux/debian buster stable
#Adding deb-multimedia from Australia
deb http://mirror.optus.net/deb-multimedia/ unstable main
deb https://www.deb-multimedia.org sid main non-free
#Adding Contrib from France
deb http://ftp.fr.debian.org/debian sid main contrib non-free
Back again live. Glen, its too bad some folks haven't thought to get on a Zoom
meeting-and-interactively help you live. That would seem faster than 3 days of
back-and-forth, but I will say you have some great minds trying to work out a
solution.
Chime