The error returned from the two current uses of get_url (both in install_pre.yml) is:

fatal: [10.0.0.63]: FAILED! => {"changed": false, "dest": "/etc/apt/trusted.gpg.d/docker-ubuntu.asc", "elapsed": 0, "msg": "An unknown error occurred: HTTPSConnection.__init__() got an unexpected keyword argument 'cert_file'", "url": "https://download.docker.com/linux/ubuntu/gpg"}

Since not every environment will have the option of upgrading ansible to version 2.16.0 or higher, we can work around it by replacing the ansible get_url calls with shell calls to curl.

Patch to follow.