add software source

add key

sudo apt-key adv --keyserver hkp://p80.pool.sks-keyservers.net:80 --recv-keys 58118E89F3A912897C070ADBF76221572C52609D

add source

sudo apt-add-repository 'deb https://apt.dockerproject.org/repo ubuntu-xenial main'

update & install

update

apt update

install

apt install -y docker-engine

Executing the Docker Command Without Sudo (Optional)

install

sudo usermod -aG docker $(whoami)

Using the Docker Command

docker [option] [command] [arguments]