Ubuntu 16.04 - > ERROR: Couldn't connect to Docker daemon - you might need to run `docker-machine start default`

Question

I am getting error on ubuntu 16.04

\"ERROR: Couldn\'t connect to Docker daemon - you might need to run docker- machine start default. \"

Answer 1

You should add your user in docker group. And then, you can use docker command without 'sudo'.

$ sudo usermod -aG docker ${USER}
$ sudo service docker restart

Next, you have to logout in your OS. Finally, when you login, you can use docker command without 'sudo'.