Uninstall docker

To remove just docker package itself from Ubuntu 16.04 (Xenial Xerus) execute on terminal:

sudo apt-get remove docker

Uninstall docker and it’s dependent packages

To remove the docker package and any other dependant package which are no longer needed from Ubuntu Xenial.

sudo apt-get remove --auto-remove docker

Purging docker

If you also want to delete configuration and/or data files of docker from Ubuntu Xenial then this will work:

sudo apt-get purge docker

To delete configuration and/or data files of docker and it’s dependencies from Ubuntu Xenial then execute:

sudo apt-get purge --auto-remove docker