Quote:.....an Ubuntu derivative.....P.S., I don't have a "Python-Fu" console, rather it is "Script-Fu,"
Depends on the version of Ubuntu and where the version of Gimp comes from.
Since you have the user Gimp profile (and for plugins) ~/.config/GIMP/2.10/plug-ins/ chances are you have Gimp from the 'buntu repositories possibly Gimp 2.10.22 which does not contain the Gimp python packages = no working python = no Filters > Python-fu menu entry.
Also possible is the latest Gimp 2.10.30 from an ubuntu PPA. No python in that either.
If you want a ready-built Gimp with python included, there is the flatpak version, look on the http://www.gimp.org page for installation details.
Note: the user profile for this is buried in ~/.var/app/org.gimp.GIMP/config/GIMP/2.10/plug-ins
There is also an older version of Gimp, an appimage, here: https://github.com/aferrero2707/gimp-appimage/releases/
I still use that Gimp 2.10.22 on a daily basis. That has its own user profile as well, ~ /.config/GIMP-AppImage/2.10/
Depending on how confident you are installing linux packages, python support can be added see: https://www.gimp-forum.net/Thread-Heal-S...4#pid18354
One warning, avoid the 'buntu 'snap' installation from the so-called Ubuntu Store. Perfectly safe and working, but no python.
Edit: just a reminder, plugins in Gimp, either python or binary need to be executable. Ofnuts python plugins in a zip package are already set as executable.