Comment 18 for bug 1979663

The bionic-ussuri validation was successful, here I'm attaching evidence of the process.

$ juju ssh openstack-dashboard/1
...
ubuntu@juju-bd8457-zaza-5e9e245b7763-17:~$ apt policy python3-magnumclient
python3-magnumclient:
  Installed: 2.11.0-0ubuntu5~cloud0
  Candidate: 2.11.0-0ubuntu5~cloud0
  Version table:
 *** 2.11.0-0ubuntu5~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-updates/ussuri/main amd64 Packages
        100 /var/lib/dpkg/status
     2.8.0-0ubuntu1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
ubuntu@juju-bd8457-zaza-5e9e245b7763-17:~$ sudo vim /etc/apt/sources.list.d/cloud-archive.list # add -proposed
ubuntu@juju-bd8457-zaza-5e9e245b7763-17:~$ sudo apt-get update -qqq
ubuntu@juju-bd8457-zaza-5e9e245b7763-17:~$ apt policy python3-magnumclient
python3-magnumclient:
  Installed: 2.11.0-0ubuntu5~cloud0
  Candidate: 2.11.0-0ubuntu6~cloud0
  Version table:
     2.11.0-0ubuntu6~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-proposed/ussuri/main amd64 Packages
 *** 2.11.0-0ubuntu5~cloud0 500
        500 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-updates/ussuri/main amd64 Packages
        100 /var/lib/dpkg/status
     2.8.0-0ubuntu1 500
        500 http://nova.clouds.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
ubuntu@juju-bd8457-zaza-5e9e245b7763-17:~$ sudo apt install --only-upgrade python3-magnumclient
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following package was automatically installed and is no longer required:
  python3-xdg
Use 'sudo apt autoremove' to remove it.
Suggested packages:
  python-magnumclient-doc
The following packages will be upgraded:
  python3-magnumclient
1 upgraded, 0 newly installed, 0 to remove and 13 not upgraded.
Need to get 69.2 kB of archives.
After this operation, 0 B of additional disk space will be used.
Get:1 http://ubuntu-cloud.archive.canonical.com/ubuntu bionic-proposed/ussuri/main amd64 python3-magnumclient all 2.11.0-0ubuntu6~cloud0 [69.2 kB]
Fetched 69.2 kB in 0s (1659 kB/s)
(Reading database ... 87217 files and directories currently installed.)
Preparing to unpack .../python3-magnumclient_2.11.0-0ubuntu6~cloud0_all.deb ...
Unpacking python3-magnumclient (2.11.0-0ubuntu6~cloud0) over (2.11.0-0ubuntu5~cloud0) ...
Setting up python3-magnumclient (2.11.0-0ubuntu6~cloud0) ...
ubuntu@juju-bd8457-zaza-5e9e245b7763-17:~$ sudo systemctl restart apache2
ubuntu@juju-bd8457-zaza-5e9e245b7763-17:~$