Where could I get _ctypes module except libffi-dev?

[Larz60+]

I found my notes for the wxpython install.
USE WITH EXTREME CAUTION
this may or may not help.
First, make sure the right version of python dev is installed. I was using 3.7 when I installed wxpython
second, replace wxpython with appropriate Kivy equivalent.
you will have to find a wheel for Kivy
but once I installed all of the packages (with the apt-get) it seemed to do the trick.
This mess took me several months to get right.
finally good luck.

Notes:

Output:
sudo apt-get install dpkg-dev
sudo apt-get install build-essential
sudo apt-get install python3.7-dev # update to appropriate Python version
sudo apt-get install libwebkitgtk-dev
sudo apt-get install libjpeg-dev
sudo apt-get install libtiff-dev
sudo apt-get install libgtk2.0-dev
sudo apt-get install libsdl1.2-dev
sudo apt-get install libgstreamer-plugins-base0.10-dev
sudo apt-get install freeglut3
sudo apt-get install freeglut3-dev
pip install -U -f https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-16.04 wxPython

see error messages:
    https://github.com/pyfa-org/Pyfa/issues/1421
 *  https://github.com/pyfa-org/Pyfa/issues/1468
    https://github.com/pyfa-org/Pyfa/issues/1557

get wheel here: https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-18.04/
make sure cp37 and 64 bit
Example: https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-18.04/wxPython-4.0.2-cp37-cp37m-linux_x86_64.whl