OK, I installed Inkscape 9.2 and the older Axidraw extensions then modified preferences.xml to reflect the current python3.8 on my Ubuntu machine and my Axidraw is back!
This is a relief, I had almost convinced myself that I had damaged the EBB board.
Thanks for all your help! I learned a few things. I do prefer to use the newest version of Inkscape so I will tinker with the SNAP install and see if I can isolate the error to the apparmor Inkscape profile.