@LandonZeKepitelOfGreytBritn so ubuntu delivers updates through update
channels. Each of those checkboxes in the "Updates" tab of
software-properties-gtk
controls one. They're coded
release-channel so in this case xenial is the release and
updates and
security were the channels we needed. I thought these were enabled by default but I guess I was wrong. You can learn more about update channels
here.