Install docker on Ubuntu 20.04

It’s pretty simple to install Docker on Ubuntu.
Target machine must have a 64-bit version of Ubuntu installed.
Procedure for installing Docker on Ubuntu 20.04 64-bit is documented below.

# Uninstall older versions, if they were already installed
sudo apt-get remove docker docker-engine containerd runc

# Update the packages index and install the dependencies necessary to add 
# a new HTTPS repository
sudo apt update
sudo apt install apt-transport-https ca-certificates curl gnupg-agent software-properties-common

# If we are installing docker for the first time on a new host system, we
# need to set up the Docker repository and import the repository's GPG key

# Import repository's GPG key using the curl command (prints OK on success)
curl -fsSL | sudo apt-key add -

# Add the docker apt repository to the system
sudo add-apt-repository "deb [arch=amd64] $(lsb_release -cs) stable"

# Install the latest version of docker
sudo apt install docker-ce docker-ce-cli

# Print list of all the available versions in the docker repository
apt list -a docker-ce

# To install a specific version (say 5:19.03.15), add the version to the package
sudo apt install docker-ce=5:19.03.15~3-0~ubuntu-focal docker-ce-cli=5:19.03.15~3-0~ubuntu-focal