As it’s a snap, the service name is different…
alan@deep-thought:~$ sudo snap install docker
[sudo] password for alan:
docker 17.06.1-ce from 'docker-inc' installed
alan@deep-thought:~$ systemctl status snap.docker.dockerd.service
â—Ź snap.docker.dockerd.service - Service for snap application docker.dockerd
Loaded: loaded (/etc/systemd/system/snap.docker.dockerd.service; enabled; vendor preset: enabled)
Active: active (running) since Sun 2017-11-19 11:14:37 GMT; 11s ago
Main PID: 4132 (dockerd)
Tasks: 20 (limit: 4915)
CGroup: /system.slice/snap.docker.dockerd.service
├─4132 dockerd -G docker --debug --log-level=debug --exec-root=/var/snap/docker/171/run/docker --graph=/var/snap/docker/common/var-lib-docker --pidfile=/var/snap/docker/171/run/docker.pid
└─4197 docker-containerd -l unix:///var/snap/docker/171/run/docker/libcontainerd/docker-containerd.sock --metrics-interval=0 --start-timeout 2m --state-dir /var/snap/docker/171/run/docker/libcontainerd/containerd --shi
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.427583305Z" level=debug msg="Registering GET, /distribution/{name:.*}/json"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.427721479Z" level=debug msg="Registering GET, /networks"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.427810782Z" level=debug msg="Registering GET, /networks/"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.427890342Z" level=debug msg="Registering GET, /networks/{id:.+}"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.428008310Z" level=debug msg="Registering POST, /networks/create"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.428101716Z" level=debug msg="Registering POST, /networks/{id:.*}/connect"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.428270147Z" level=debug msg="Registering POST, /networks/{id:.*}/disconnect"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.428403775Z" level=debug msg="Registering POST, /networks/prune"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.428516688Z" level=debug msg="Registering DELETE, /networks/{id:.*}"
Nov 19 11:14:40 deep-thought docker.dockerd[4132]: time="2017-11-19T11:14:40.429434681Z" level=info msg="API listen on /var/run/docker.sock"