https://waypoint.liquidweb.com/display/LINUX/Ubuntu+Core+Managed#UbuntuCoreManaged-SSHingIn

Right at the top of this wiki, it shows how you have to add "AllowUsers root" to the sshdconfig for core managed ubuntu servers. In ticket 12501940, we ran into this issue, where we couldn't ssh in, because neither root nor the lwadmin user was added to the sshdconfig. We need to set "AllowUsers root" at least within our Core Managed Ubuntu kicks, so that when the server comes online, we can actually get to the thing over ssh.