microk8s inspect incorrectly claims that docker is installed

Running microk8s inspect was telling me that docker was installed. I fully removed including running apt purge it and still got the following message:

WARNING:  Docker is installed. 
File "/etc/docker/daemon.json" does not exist. 
You should create it and add the following lines: 
{
    "insecure-registries" : ["localhost:32000"] 
}
and then restart docker with: sudo systemctl restart docker

It was only after looking at the code that I figured out what was actually happening. It turns out that that just having /etc/docker is all that is needed to get this warning.

https://github.com/ubuntu/microk8s/blob/5e23ac6a001bf3fee2cbb3cd4f1781c6bc945e7e/scripts/inspect.sh#L161

[wayneconnolly]

On a previous server I had docker installed, then I uninstalled it. It left the directory /etc/docker behind. When I installed microk8s it complained of docker being installed. I deleted the directory and all was good after that. I think a better check would be /bin/docker.

[gerrywastaken]

Thank you @neoaggelos ❤️