I did find have a problem with getting Lightburn to communicate with my xTool D1 non-Pro in my fresh Linux Mint install. Apparently ch341 UART converter was being claimed by the BRLTTY application. This is something that is automatically installed when you do a default install of Linux Mint. The only way I could find to get this cleared up was to remove the BRLTTY app (not a big deal for me since I don’t have a braille keyboard.) The command for doing so within Mint was
sudo apt-get remove --autoremove brltty
I hope this helps someone else in the future.