Install Docker Engine CE on Ubuntu 20.04 focal fossa

install_docker.sh

# Grabbed from https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-20-04 

sudo apt update
# Install a few prerequisite packages which let apt use packages over HTTPS
sudo apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common
# Add the GPG key for the official Docker repository to your system
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -
# Add the Docker repository to APT sources
sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu focal stable"
sudo apt update
# Make sure you are about to install from the Docker repo instead of the default Ubuntu repo
apt-cache policy docker-ce
sudo apt install docker-ce