[Bug 1497024] [NEW] release upgrades should jump over unsupported releases

[Brian Murray]

Public bug reported:

Currently, users of 14.04 LTS with /etc/update-manager/release-
upgrades's prompt set to normal are offered to upgrade to the
unsupported release 14.10. In the past when 13.04 became unsupported
before 12.10 we offered upgrades from 12.10 to 13.10. Skipping an
unsupported release also puts us in a better position to ensure LTS to
LTS upgrades work. Subsequently, update-manager and ubuntu-release-
upgrader should be modified so that users can upgrade from 14.04 to
15.04.

The changes to update-manager will be generic enough to work going
forward and the ubuntu-release-upgrader changes may require regular
updates as a release becomes End of Life.

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: High
         Status: New

** Affects: update-manager (Ubuntu)
     Importance: High
         Status: New

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https://bugs.launchpad.net/bugs/1497024

Title:
  release upgrades should jump over unsupported releases

Status in ubuntu-release-upgrader package in Ubuntu:
  New
Status in update-manager package in Ubuntu:
  New

Bug description:
  Currently, users of 14.04 LTS with /etc/update-manager/release-
  upgrades's prompt set to normal are offered to upgrade to the
  unsupported release 14.10. In the past when 13.04 became unsupported
  before 12.10 we offered upgrades from 12.10 to 13.10. Skipping an
  unsupported release also puts us in a better position to ensure LTS to
  LTS upgrades work. Subsequently, update-manager and ubuntu-release-
  upgrader should be modified so that users can upgrade from 14.04 to
  15.04.

  The changes to update-manager will be generic enough to work going
  forward and the ubuntu-release-upgrader changes may require regular
  updates as a release becomes End of Life.

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