Install Docker on Ubuntu-16.04

install_docker_ubuntu_16.04.sh

# add the GPG key for the official Docker repository to the 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 $(lsb_release -cs) stable"

# update the package database with the Docker packages from the newly added repo
sudo apt-get update

# install from the Docker repo instead of the default Ubuntu 16.04 repo
apt-cache policy docker-ce

# install docker
sudo apt-get install -y docker-ce

# check if the docker daemon is running
sudo systemctl status docker

# add user to docker group
sudo usermod -aG docker ${USER}
su - ${USER}
id -nG