# Identify what installed package you have:
dpkg -l | grep -i docker

# Purge and clean up
sudo apt-get purge -y docker-engine docker docker.io docker-ce docker-ce-cli docker-compose-plugin
sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce docker-compose-plugin

# Delete all Docker images, containers, and volumes and clean up groups and etc
sudo apt-get purge -y docker-engine docker docker.io docker-ce  
sudo apt-get autoremove -y --purge docker-engine docker docker.io docker-ce  
sudo umount /var/lib/docker/
sudo rm -rf /var/lib/docker /etc/docker
sudo rm /etc/apparmor.d/docker
sudo groupdel docker
sudo rm -rf /var/run/docker.sock
sudo rm -rf /usr/bin/docker-compose