How to remove docker completely from ubuntu 14.04

Question

I installed Docker on Ubuntu a while back but when I tried to remove, the Docker still exists in the system. I followed this https://stackoverflow.com/a/31313851/2340159 but did

Answer 1

sudo apt-get remove docker docker-engine docker.io containerd runc
sudo rm -rf /var/lib/docker
sudo apt-get autoclean
sudo apt-get update