$ su root
# curl -fsSL https://download.docker.com/linux/ubuntu/gpg | apt-key add -
# add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"
# apt update
# apt-cache policy docker-ce
# apt-get install -y docker-ce
# systemctl status docker
# usermod -aG docker ${USER}