Comment 8 for bug 1999197

[ Impact ]
There is currently no version of Mailman in Ubuntu 22.04, meaning that people who depend on its functionality have limited options:
Stay on an older version of Ubuntu, but miss out on other update packages
Use a non-LTS Ubuntu release, but this results in a less stable experience and Mailman is principally a server package.
Manually install the Debian package, but this requires manually updating it.
[ Test Plan ]
Examining the Jammy package list (https://packages.ubuntu.com/jammy/allpackages ) reveals that mailman3 is not included in Jammy.
[ Where problems could occur ]
Several packages are still present in Jammy, such as mailman3-web, despite mailman3 being removed. They will also have to be tested
and potentially updated to be compatible with the version backported from Mantic.