ImportError: cannot import name 'Union' from '_ctypes' (unknown location)

[Larz60+]

I'm not sure if this will work, but it's worth a try.

First install all of the packages that you need on a computer with internet access, using pip

• All of the following on computer with internet:
  • create a virtual environment In a new directory, using python 3.8.5 with python -m venv venv
    
  • activate the virtual environment with command: . ./venv/bin/acctivate
    
  • Upgrade pip to eliminate annoying warnings: pip install --upgrade pip
    
  • check to see if the packages are already installed on the internet computer with pip list
    
  • download missing packages with pip install packagename
    
  • copy all missing (only) packages from venv/lib/python3.8/site-packages to thumb drive in a lib/site_packages directory.
    
  • Do the same for venv/lib64/python3.8/site-packages and save on thumb drive lib64/site_packages directory.
    
  • libraries have to be installed with yum, or apt-get (depending on your distro, can check with which yum or which apt
    
  • for these libraries, first see if they are already installed,
    look in /usr/share/doc/ if there, create a user/share/doc directory (on thumb drive) and copy there
    
  • if not there install (preferable to use synaptic package manager, but you can also use: sudo apt-get install libffi-dev
    do the same for all libraries and then copy to thumb drive
    
  • deactivate
    
  • remove venv diretory you created earlier.
    
• on computer with out internet:
  • copy libaries from thumb drive to /usr/share/doc/ (use sudo)
    
  • copy pip files to venv/lib/python3.8/site-packages and venv/lib64/python3.8/site-packages respectively.
    

Edited 9:02 PM DST Forgot important step