Docker in Ubuntu, Ubuntu in Docker

“Docker is now officially in Ubuntu. That makes Ubuntu 14.04 LTS the first enterprise grade Linux distribution to ship with Docker natively packaged, continuously tested, and instantly installable. Millions of Ubuntu servers are now never more than three commands away from launching or managing Linux container sandboxes, thanks to Docker…”

http://blog.docker.io/2014/04/docker-in-ubuntu-ubuntu-in-docker/