How to Incorporate https:// with "git submodule update --init --recursive"

This has not been an issue for me… Perhaps you forgot to change directories in a step? Post 14 in this thread I outline the steps for constructing the SITL using Ubuntu 20.04 and python3.

https://community.dojofordrones.com/t/launchsitl-cant-find-main-in-module-in-error/638/14

Remember to remove the dronekit ‘exceptions’ library as it doesn’t work with python3.