[WxPython] Linux: No module named 'wx'

[snippsat]

Next I tried:

sudo apt remove python3

Still 3.8.2
How do I get rid of 3.8.2 without doing something like "ln -s ..."?

You most never do this,if it now have removed the default python 3.6 that comes per-installed Ubuntu 18.
It can mess dependencies that Linux use from this default version.

If have compile yourself to 3.7,then can set alias to that version in ~/.bashrc.

alias python3=/usr/local/bin/python3.7

or look at https://python-forum.io/Thread-Part-1-Li...3#pid18603 for using pyenv for version management

That's link to my older setup for pyenv.
Here is the new Thread pyenv Simple Python Version Management
So here a demo setting up WxPython when using pyenv.

tom@tom:~$ python -V
Python 3.8.1

# Go Back to 3.7,easy with pyenv
tom@tom:~$ pyenv global 3.7.3
tom@tom:~$ python -V
Python 3.7.3

# Install the one dependency that pyenv need to run wxpython
sudo apt-get update
sudo apt-get install libpython3.7-dev

# Install WxPython
pip install https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-18.04/wxPython-4.0.2-cp37-cp37m-linux_x86_64.whl

# Test that it work
tom@tom:~$ python
Python 3.7.3 (default, Apr 17 2019, 11:23:54) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import wx
>>> 
>>> wx.__version__
'4.0.2'
>>> exit()