Single-script installer for the latest stable Docker for Ubuntu. Source: https://docs.docker.com/install/linux/docker-ce/ubuntu/

install-docker-sh

#!/bin/bash

# SET UP THE REPOSITORY
# Update the apt package index:
apt update

# Install packages to allow apt to use a repository over HTTPS:
apt-get install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common

# Add Docker’s official GPG key:
curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -

# Use the following command to set up the stable repository.
apt-key fingerprint 0EBFCD88

# Use the following command to set up the stable repository.
add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

# INSTALL DOCKER ENGINE - COMMUNITY
# Update the apt package index.
apt-get update

# Install the latest version of Docker Engine - Community and containerd
apt-get install -y docker-ce docker-ce-cli containerd.io

# Add current user to the docker group
usermod -aG docker ${USER}