ubuntu@skull-canyon:~$ sudo adduser --system docker
Adding system user `docker' (UID 123) ...
Adding new user `docker' (UID 123) with group `nogroup' ...
Creating home directory `/home/docker' ...
ubuntu@skull-canyon:~$ sudo addgroup --system docker
Adding group `docker' (GID 131) ...
Done.
ubuntu@skull-canyon:~$ snap install docker
docker 1.11.2-9 from 'docker-inc' installed
ubuntu@skull-canyon:~$ sudo docker --version
Docker version 1.11.2, build v1.11.2-snap-38fd0d3
ubuntu@skull-canyon:~$ sudo docker run hello-world
Unable to find image 'hello-world:latest' locally
latest: Pulling from library/hello-world
78445dd45222: Pull complete 
Digest: sha256:c5515758d4c5e1e838e9cd307f6c6a0d620b5e07e6f927b07d05f6d12a1ac8d7
Status: Downloaded newer image for hello-world:latest

Hello from Docker!
This message shows that your installation appears to be working correctly.

To generate this message, Docker took the following steps:
 1. The Docker client contacted the Docker daemon.
 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
 3. The Docker daemon created a new container from that image which runs the
    executable that produces the output you are currently reading.
 4. The Docker daemon streamed that output to the Docker client, which sent it
    to your terminal.

To try something more ambitious, you can run an Ubuntu container with:
 $ docker run -it ubuntu bash

Share images, automate workflows, and more with a free Docker ID:
 https://cloud.docker.com/

For more examples and ideas, visit:
 https://docs.docker.com/engine/userguide/