When I try to install anything with pip or pip3, I get:
$ sudo pip3 install python3-tk
Tra
This problem is caused by a mismatch between your pip installation and your requests installation.
As of requests version 2.4.0 requests.compat.IncompleteRead has been removed. Older versions of pip, e.g. from July 2014, still relied on IncompleteRead. In the current version of pip, the import of IncompleteRead has been removed.
So the one to blame is either:
You can solve this issue, by either updating pip via Ubuntu (if there is a newer version) or by installing pip aside from Ubuntu.