Recently, we were receiving the above error on a GNU/Linux Ubuntu 20.04 LTS.
AttributeError: module 'html5lib.treebuilders' has no attribute '_base'
We had installed
pip. To solve the issue, we had to uninstall the
html5lib that was installed by
pip and install it through
# Remove html5lib if you have installed it with pip3: pip3 uninstall html5lib; pip3 install --upgrade beautifulsoup4 sudo apt-get install python3-html5lib