Answer by Noisy_Botnet for How do I install Docker on Ubuntu 16.04 LTS?

To install the community edition, add the GPG key

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

Add the docker repository

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

To make sure, you're going to install docker from Docker repo,

apt-cache policy docker-ce

Now install docker,

sudo apt-get install -y docker-ce

It would be running by default, but you can check the status

sudo systemctl status docker