Uninstalling Docker-engine from Ubuntu 14.04

Completely Uninstalling Docker-engine including Configuration data and other dependencies

        sudo apt-get purge --auto-remove docker-engine

Uninstalling Docker and its dependencies

        sudo apt-get remove --auto-remove docker-engine

Uninstalling Docker and its configuration data

        sudo apt-get purge docker-engine

Uninstalling only Docker

        sudo apt-get remove docker-engine