Install Docker on Ubuntu 16.04

Taken from https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-16-04

If you install the '/etc' files on Ubuntu <=17 pay attentions at /etc/systemd/system/docker.* files

curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo apt-key add -

sudo add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"

sudo apt-get install \
    apt-transport-https \
    ca-certificates \
    curl \
    software-properties-common

sudo apt-get update

apt-cache policy docker-ce

sudo apt-get install -y docker-ce

sudo systemctl status docker

sudo usermod -aG docker ${USER}

su - ${USER}

id -nG