maas-region-controller-2.9 depends on maas transitional package

When trying to install MAAS 2.9 on Focal apt thinks maas-region-controller depends on the maas transitional Snap. That prevents things like isc-dhcp-server from being installed leaving you with a broken MAAS.

$ sudo add-apt-repository -y ppa:maas/2.9
sudo: setrlimit(RLIMIT_CORE): Operation not permitted
Hit:1 http://archive.ubuntu.com/ubuntu focal InRelease
Get:2 http://ppa.launchpad.net/maas/2.9/ubuntu focal InRelease [18.0 kB]
Hit:3 http://security.ubuntu.com/ubuntu focal-security InRelease
Hit:4 http://archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://archive.ubuntu.com/ubuntu focal-backports InRelease
Get:6 http://ppa.launchpad.net/maas/2.9/ubuntu focal/main amd64 Packages [956 B]
Get:7 http://ppa.launchpad.net/maas/2.9/ubuntu focal/main Translation-en [480 B]
Fetched 19.5 kB in 1s (15.0 kB/s)
Reading package lists... Done
$ sudo apt install -y maas-region-controller maas-rack-controller
sudo: setrlimit(RLIMIT_CORE): Operation not permitted
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  libfreetype6
Use 'sudo apt autoremove' to remove it.
The following additional packages will be installed:
  maas maas-region-api
The following NEW packages will be installed:
  maas maas-rack-controller maas-region-api maas-region-controller
0 upgraded, 4 newly installed, 0 to remove and 1 not upgraded.
Need to get 9308 B of archives.
After this operation, 45.1 kB of additional disk space will be used.
Get:1 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 maas all 1:0.7 [4732 B]
Get:2 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 maas-rack-controller all 1:0.7 [1524 B]
Get:3 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 maas-region-api all 1:0.7 [1520 B]
Get:4 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64 maas-region-controller all 1:0.7 [1532 B]
Fetched 9308 B in 1s (17.9 kB/s)
Preconfiguring packages ...
Selecting previously unselected package maas.
(Reading database ... 38841 files and directories currently installed.)
Preparing to unpack .../archives/maas_1%3a0.7_all.deb ...
Warning: /snap/bin was not found in your $PATH. If you've not restarted your session since you
         installed snapd, try doing that. Please see https://forum.snapcraft.io/t/9469 for more
         details.

maas (2.7/stable) 2.7.2-8284-g.037e34a46 from Canonical✓ installed
Unpacking maas (1:0.7) ...
Selecting previously unselected package maas-rack-controller.
Preparing to unpack .../maas-rack-controller_1%3a0.7_all.deb ...
Unpacking maas-rack-controller (1:0.7) ...
Selecting previously unselected package maas-region-api.
Preparing to unpack .../maas-region-api_1%3a0.7_all.deb ...
Unpacking maas-region-api (1:0.7) ...
Selecting previously unselected package maas-region-controller.
Preparing to unpack .../maas-region-controller_1%3a0.7_all.deb ...
Unpacking maas-region-controller (1:0.7) ...
Setting up maas (1:0.7) ...
Setting up maas-rack-controller (1:0.7) ...
Setting up maas-region-api (1:0.7) ...
Setting up maas-region-controller (1:0.7) ...
$ apt-cache rdepends --no-recommends --no-suggests --no-enhances --recurse maas
maas
Reverse Depends:
  maas-rack-controller
  maas-region-api
  maas-rack-controller
  maas-region-api
maas-rack-controller
Reverse Depends:
  maas
  maas
  maas
  maas
maas-region-api
Reverse Depends:
  maas-region-controller
  maas
  maas
  maas
  maas-region-controller
  maas
maas-region-controller
Reverse Depends:
  maas
  maas
  maas
  maas