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

Hi Rongzhong Li, 1. Yes, I did remove the "-main" suffix and changed the directory name to 'OpenCat'. 2. However, I messed up greatly by changing the Ubuntu 20.04 default Python to 3.10 and then I've rolled back these changes too. And yet I'm getting the below error, which is also due to the same reason why UI.py is not executing. I'm sure it's all because I messed with Python's default version. Whenever I run a ```pip3 install ``` command, this is what I get. I suppose that any pip command is causing the packages to be installed in /usr/lib/python3.10 instead of v 3.8.2. I hope reinstallation is not the only choice! Thanks