Thanks… so I just perused the MAAS ADVANCED Network Installation and Configuration doc (MANIACS)… which said the following…
Beginning with Ubuntu 20.04, MAAS is installed via a snap by default, rather
than the Debian packages used in earlier versions of Ubuntu; however, this
document describes installing MAAS via Debian packages. Use of an older
version of Ubuntu is no longer supported, and use of snaps for MAAS is
discouraged.
Which is why I had asked about SNAP vs DEB install.