[ERROR] sudo: add-apt-repository: command not found

- sudo: add-apt-repository: command not found
https://askubuntu.com/questions/422975/e-package-python-software-properties-has-no-installation-candidate

- ModuleNotFoundError: No module named 'apt_pkg'
https://stackoverflow.com/questions/13708180/python-dev-installation-error-importerror-no-module-named-apt-pkg

- ImportError: cannot import name '_gi' from 'gi' (/usr/lib/python3/dist-packages/gi/__init__.py)
https://stackoverflow.com/questions/63561684/docker-installation-importerror-cannot-import-name-gi-from-gi-usr-lib-p

해결..!!!