As of April 18 2014 these images are based on the official Ubuntu Minimal packages. They are pretty barebones. See the links under 'installed packages' to find which packages are installed.

$ docker images ubuntu
REPOSITORY          TAG                 IMAGE ID    
ubuntu              10.04               3db9c44f4520
ubuntu              12.04               1edb91fcb5b5
ubuntu              12.10               0232356d9a18
ubuntu              13.04               2e68994ad893
ubuntu              13.10               9d076f5398dd
ubuntu              14.04               c1bd2f6276a1
ubuntu              latest              c1bd2f6276a1
ubuntu              lucid               3db9c44f4520
ubuntu              precise             1edb91fcb5b5
ubuntu              quantal             0232356d9a18
ubuntu              raring              2e68994ad893
ubuntu              saucy               9d076f5398dd
ubuntu              trusty              c1bd2f6276a1

sources.list

$ docker run ubuntu:14.04 grep -v '^#' /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu/ trusty main restricted
deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted

deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted

deb http://archive.ubuntu.com/ubuntu/ trusty universe
deb-src http://archive.ubuntu.com/ubuntu/ trusty universe
deb http://archive.ubuntu.com/ubuntu/ trusty-updates universe
deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates universe


deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted
deb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted
deb http://archive.ubuntu.com/ubuntu/ trusty-security universe
deb-src http://archive.ubuntu.com/ubuntu/ trusty-security universe

$ docker run ubuntu:12.04 cat /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://archive.ubuntu.com/ubuntu/ precise main restricted

deb http://archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://archive.ubuntu.com/ubuntu/ precise-updates main restricted

deb http://archive.ubuntu.com/ubuntu/ precise universe
deb-src http://archive.ubuntu.com/ubuntu/ precise universe
deb http://archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://archive.ubuntu.com/ubuntu/ precise-updates universe


deb http://archive.ubuntu.com/ubuntu/ precise-security main restricted
deb-src http://archive.ubuntu.com/ubuntu/ precise-security main restricted
deb http://archive.ubuntu.com/ubuntu/ precise-security universe
deb-src http://archive.ubuntu.com/ubuntu/ precise-security universe

Issues

If you run into any problems with this image, please check (and potentially file new) issues on the tianon/docker-brew-ubuntu-core repo, which is the source for this image.

Installed packages

Issues and Contributing

If you have any questions about the image, please contact us through a GitHub issue or in the IRC channel #docker-library on Freenode.

If you want to contribute, we are always thrilled to receive pull requests, and do our best to process them as fast as possible. Not sure if that typo is worth a pull request? Do it! We will appreciate it.

If your pull request is not accepted on the first try, don't be discouraged! If there's a problem with the implementation, hopefully you received feedback on what to improve.

We recommend discussing your plans through a GitHub issue before starting to code - especially for more ambitious contributions. This gives other contributors a chance to point you in the right direction, give feedback on your design, and maybe point out if someone else is working on the same thing.

Any significant improvement should be documented as a GitHub issue before anybody starts working on it. Please take a moment to check that an issue doesn't already exist documenting your bug report or improvement proposal. If it does, it never hurts to add a quick "+1" or "I have this problem too". This will help prioritize the most common problems and requests.