First I installed the Flatpack 1.0 version. Right now uninstalled it and then installed the normal one from the Ubuntu repository.
The Axidraw version is: ad_ink1_263
The error text is:
Traceback (most recent call last):
File “axidraw_control.py”, line 7, in <module>
from lxml import etree
ModuleNotFoundError: No module named ‘lxml’
I have run inkscape as root and i got the same message.
I also tried your unplug recommendation but unfortunately it did not worked. I also log out and reboot my computer several times and it did not worked.