First you need to install this library:
pip install python-chess
And make sure you're using the right pip, because still in some Linus distros pip and python are python 2.x and for python 3.x you should use pip3 and python3. If you want to check try this:
pip --version
You will see an output like this that will tell you what python you're using, in my case it's 3.8:
pip 19.2.3 from /usr/lib/python3.8/site-packages/pip (python 3.8)
