Fix broken Python / PIP installation on Ubuntu 16.04

My Python / PIP3 environment is broken on a Ubuntu 16.04 machine. I just want to install a software using: pip3 install --user ocrmypdf But it doesn't work. When running pip3 --version I get this error: Traceback (most recent call last): File "/usr/local/bin/pip3", line 7, in <module> from pip import main File "/usr/lib/python3/dist-packages/pip/[login to view URL]", line 59, in <module> from [login to view URL] import logger File "/usr/lib/python3/dist-packages/pip/[login to view URL]", line 9, in <module> import colorama, pkg_resources File "<frozen importlib._bootstrap>", line 971, in _find_and_load File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 656, in _load_unlocked File "<frozen importlib._bootstrap>", line 626, in _load_backward_compatible File "/usr/share/python-wheels/[login to view URL]", line 1479, in <module> register_loader_type([login to view URL], DefaultProvider) AttributeError: module 'importlib._bootstrap' has no attribute 'SourceFileLoader' Python itself seems to work: root@host /usr/lib # python -V Python 3.6.3 To fix the problem I provide a Teamviewer session where you have access to the Ubuntu server where the problem exists.