How to stop docker under Linux

Question

My version of OS Ubuntu 16.04. I want to stop docker, so I run in the terminal:

sudo systemctl stop docker

But this commands doesn

Answer 1

In my case, it was neither systemd nor a cron job, but it was snap. So I had to run:

sudo snap stop docker
sudo snap remove docker

... and the last command actually never ended, I don't know why: this snap thing is really a pain. So I also ran:

sudo apt purge snap

:-)