So I went ahead and tried to install mailman3 on ubuntu 24.04 using the virtual environment approach. It worked like a charm. There were a very few glitches, all from me not reading the instructions closely (e.g. not replacing MY_SERVER with my server name, Doh). The whole thing, from start to finish was about two hours.
I appreciate all y'alls efforts in this.
The reason I'm doing this is that I'm having to migrate from a server that's going to be defunct soon. I've been running a mailman3 mailing list on that for a few years.
Is there a tutorial/instructions on migrating data from an old system to a new one? It's actually not the end of the world if I don't get all the old emails transferred, but I'd like to get the email addresses of the participants moved over easily... I believe that I set it up in 2020, but did not do any version upgrades since then...
Thanks!
billo