Comment 22 for bug 2074309

I verified the upgrade quirk using ubuntu-release-upgrader from noble-proposed:

nr@six:~$ lxc launch ubuntu:jammy jammy
nr@six:~$ lxc exec jammy bash
root@jammy:~# apt install -y rabbitmq-server
[ ...SNIP... ]
root@jammy:~# do-release-upgrade --proposed
Checking for a new Ubuntu release
There is no development version of an LTS available.
To upgrade to the latest non-LTS development release
set Prompt=normal in /etc/update-manager/release-upgrades.
root@jammy:~# sed -i 's/Prompt=lts/Prompt=normal/g' /etc/update-manager/release-upgrades
root@jammy:~# do-release-upgrade --proposed
[ ...SNIP... ]

Reading package lists... Done
Building dependency tree... Done
Reading state information... Done

Unable to upgrade to Ubuntu 24.04 LTS

Currently, you have RabbitMQ server installed, which is not directly
upgradable to the newer version. Upgrading may prevent the server
from starting due to missing feature flags.

For more information, please see
https://bugs.launchpad.net/bugs/2074309.

Restoring original system state

Aborting
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done