[Bug 2075969] Re: lunar/mantic releases unable to do-release-upgrade to jammy

[Brian Murray]

Actually, we are missing a parallel to DistUpgrade.cfg.jammy named
DistUpgrade.cfg.kinetic and DistUpgrade.cfg.lunar. As there needs to be
a DistUpgrade.cfg for the release from which you are upgrading which
says what release you can upgrade to (see [Sources]) among other things.

This all seems prone to breakage though.

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: Undecided => High

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Confirmed => Triaged

** Also affects: ubuntu-release-upgrader (Ubuntu Noble)
   Importance: Undecided
       Status: New

** Tags added: rls-nn-incoming

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https://bugs.launchpad.net/bugs/2075969

Title:
  lunar/mantic releases unable to do-release-upgrade to jammy

Status in ubuntu-release-upgrader package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Noble:
  New

Bug description:
  [Current Behavior]
  Users still on Kinetic and Lunar are prompted to upgrade to Noble via the motd, however d-r-u claims that upgrading from those releases -> noble is unsupported. You also can not upgrade to mantic anymore, so you would need to manually change your sources to facilitate the upgrade.

  [Expected Behavior]
  Despite these releases being EOL, historically we have allowed d-r-u (hirsute->jammy for example).

  [Replication Steps]
  Launch a lunar instance, upgrade to latest packages, and call do-release upgrade

  [Root Cause]
  It appears that we're missing DistUpgrade.cfg.jammy for kinetic/lunar's UpgradeTools . Ideally we should fix this to allow easier upgrades to supported releases, as we had previously.

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