docker.io software package provides Linux container runtime, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install docker.io
docker.io is installed in your system.
Make ensure the docker.io package were installed using the commands given below,
$ sudo dpkg-query -l | grep docker.io *
You will get with docker.io package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Administration Utilities |
| Package | docker.io |
| Version | 0.9.1~dfsg1-2 |
| Description | Linux container runtime |
| Sub Section | Admin |