How does MAAS work with Ubuntu 18

Hello all,
               I downloaded the ISO for Ubuntu. I am asking about how I can learn more about installing MAAS. During installation from my boot disk, it offered 3 options, (1) Install Ubuntu server, (2) MAAS regional and (3) MAAS rack. It was an Ubuntu server live iso. I have been meaning to learn about type 1 hypervisors for my IT skills advancement. So, MAAS is supposed to be bare metal type 1 hypervisor/virtualization. So, why does it appear to install a full copy of Ubuntu?
                My second question is about accessing the web-based control panel from a second computer in the same LAN. I got an error saying that the target device actively refused the connection. This is immediately following installation.
              Can someone explain this to me and then refer me to further training online?

Thanks,
Bruce