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

[Kyler Hornor]

Public bug reported:

[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.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: Confirmed

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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:
  Confirmed

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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