Hey guys,
Here's an update. The configuration file for pip in 20.04 located at "~/.config/pip/pip.conf" had a path set in a directory named '/Users' as you can see in the snap image, last line. I changed that address to the directory where it is supposed to be. The path is ```target = /home/build-system/.local/lib/python3.8/site-packages```
Although it solved the problem of getting that red-text error, the problem when we run the pyUI.py file and get the 'no module named serial.tools', persists.
Therefore, I download freshly, a new OpenCat folder and ran the OpenCat.ino file on Arduino, and when I click the verify or upload buttons, it shows that the src/OpenCat.h does not exist, which I can attribute to bad Arduino installation. Let's see if this gets solved asap.
Thanks