no module name "_ctypes" when trying to pip install
For those who hit this issue and have root access, you may be able to correct by following the instructions below. Otherwise, you may need to contact your Sys Admin.
The issue is likely a missing installation of libffi-dev which can be installed with:
sudo apt install libffi-dev
Note: You may need to uninstall and re-install python to get this to work. In my case, It would not stick until I re-installed.