The root cause of an error is: /usr/bin/python3.9: No module named py_compile.
This will prevent python3 packages from installing as the dpkg errors out during configuration.
A more complete error example, will look something like this:
Setting up python3.9-minimal (3.9.2-1) … /usr/bin/python3.9: can’t open file ‘/usr/lib/python3.9/py_compile.py’: [Errno 2] No such file or directory dpkg: error processing package python3.9-minimal (–configure): installed python3.9-minimal package post-installation script subprocess return ed error exit status 2 Errors were encountered while processing: python3.9-minimal E: Sub-process /usr/bin/dpkg returned an error code (1) … /usr/bin/python3.9: No module named py_compile
Regardless of the package name, missing the py_compile will give plenty of issues. Here comes an easy fix.