Error "docker.service is a disabled or a static unit, not starting it"

I re-created a new Kubernetes system. When I install docker, I got an error "docker.service is a disabled or a static unit, not starting it"

Created symlink /etc/systemd/system/sockets.target.wants/docker.socket → /lib/systemd/system/docker.socket.
docker.service is a disabled or a static unit, not starting it.
Processing triggers for systemd (237-3ubuntu10.39) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for ureadahead (0.100.0-21) ...

How can I fix it?

Thanks,

Wei