[Bug 2046665] Re: Upgrade to mantic: RabbitMQ upgrade 3.10.8 -> 3.12 fails

[Mitchell Dzurick]

** Also affects: rabbitmq-server (Ubuntu)
   Importance: Undecided
       Status: New

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Title:
  Upgrade to mantic: RabbitMQ upgrade 3.10.8 -> 3.12 fails

Status in rabbitmq-server package in Ubuntu:
  New
Status in ubuntu-release-upgrader package in Ubuntu:
  New

Bug description:
  In Ubuntu Lunar, the rabbitmq-server version is 3.10.8, in Ubuntu Mantic, it is 3.12.1. RabbitMQ 3.12 requires a feature flag `classic_queue_type_delivery_support`, which was only added in 3.10.9. A feature flag needs to be enabled before the upgrade, but it cannot be enabled from the Lunar version.
  (Feature flag `classic_mirrored_queue_version` is also required by 3.12 and is not automatically enabled, but at least downgrading and enabling it works).

  Therefore, the upgrade path for rabbitmq-server using only Ubuntu-
  provided packages is broken; I had to install RabbitMQ off of their
  own Debian service to be able to install the required intermediate
  version to enable the feature flag, before installing the Mantic
  version. do-release-upgrade can never succeed if you ave rabbitmq-
  server installed - the package will not be able to be configured.

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