[Bug 2075969] Re: add support to do-release-upgrade for (EOL) kinetic/lunar to noble upgrades

[Launchpad Bug Tracker]

** Merge proposal linked:
   https://code.launchpad.net/~enr0n/ubuntu-release-upgrader/+git/ubuntu-release-upgrader/+merge/480726

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

Title:
  add support to do-release-upgrade for (EOL) kinetic/lunar to noble
  upgrades

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

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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