David Newman writes:
Interesting -- that does produce two directories with names starting with a tilde:
/opt/mailman/venv/lib/python3.9/site-packages/~jango: /opt/mailman/venv/lib/python3.9/site-packages/~jango-3.0.14.dist-info:
I would guess that those are the previous versions before the upgrade, moved out of the way in case a revert-to-previous was needed. Again, guessing, they should have been removed by the upgrade process once the new package was fully installed. Was there an interrupted or partially successful upgrade in the past?
So I would guess you can remove them. Probably you have the relevant Ubuntu packages cached somewhere, and they're probably available from Ubuntu if you really wanted them. If you're really paranoid, you could tar them up and stick them somewhere out of the way, but I think just delete them. I doubt anything can refer to them by that name, except for a process that was running before the update.
It's also possibly that apt (or whatever package manager) has a "fix broken" command that might clean them up for you. "apt-get update --fix-broken" and "apt autoremove" are possibilities with apt.
Steve