In ubuntu 16.04 image installed on VC1S server I was unable to install docker.
It hangs/fails on installation or on any significant docker command like docker ps
The error I got was
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details
and
level=error msg="devmapper: Unable to delete device: devicemapper: Can't set task name /dev/mapper/docker
I switched to “docker” image where docker is preinstalled