pip: no module named _internal

Question

I have a problem when I try to use pip in any way. I\'m using Ubuntu 16.04.4

I should say that I\'ve used it already, and I never had any problem, but starting today

Answer 1

For completeness, I just encountered this problem with "Ubuntu latest" ... v18.04 ... and fixed it in this way:

python3 -m pip install --upgrade pip

(Notice that it was necessary to specify python3 since this references Python 3.6.9. The python command on the same system references Python 2.7.17. Since this is apparently a system-wide installation it encountered a ["not sudo" ...] permission error, but it didn't matter because it was the wrong thing to do anyway. I was encountering the problem with pip3.)