[linux] Docker command can't connect to Docker daemon

Giving non-root access - from docker

Add the docker group if it doesn't already exist.

$ sudo groupadd docker

Add the connected user "${USER}" to the docker group.

Change the user name to match your preferred user.

You may have to logout and log back in again for this to take effect.

$ sudo gpasswd -a ${USER} docker

Restart the Docker daemon.

$ sudo service docker restart

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