[Bug 1569324] Re: Update Manager shouldn't suggest 14.04 -> 15.10 unsupported upgrade path

[Brian Murray]

> As far as I can see Ubuntu only supports 2 release upgrade paths[1]:
> 
>    1. ${release} upgrade to ${next-release} (e.g. for 14.04 -> 15.10, you'll have to 14.04 -> 14.10 -> 15.04 -> 15.10, 3 upgrades in a row)

That is incorrect actually and is documented in bug 1497024, the changes
happened in this version of update-manager.

update-manager (1:15.10.1) wily; urgency=medium

  * UpdateManager/Core/MetaRelease.py: When not running in development mode,
    if the next release is unsupported do not offer to upgrade to that, but
    the release after it. When running in development mode continue to offer
    upgrading to unsupported release. (LP: #1497024)


** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1569324

Title:
  Update Manager shouldn't suggest 14.04 -> 15.10 unsupported upgrade
  path

Status in ubuntu-release-upgrader package in Ubuntu:
  Invalid

Bug description:
  As far as I can see Ubuntu only supports 2 release upgrade paths[1]:

      1. ${release} upgrade to ${next-release} (e.g. for 14.04 -> 15.10, you'll have to 14.04 -> 14.10 -> 15.04 -> 15.10, 3 upgrades in a row)
      2. ${lts-release} upgrade to ${next-lts-release} (e.g. for 12.04 -> 14.04, you can do a direct upgrade)

  However currently on a ubuntu 14.04 if user chooses to "show any new
  Ubuntu versions" Update Manager(and do-release-upgrade) will suggest
  to directly upgrade to Ubuntu 15.10, this upgrade path has been
  verified[2] to cause entire system hang during the upgrade process and
  even if you do a hard reboot you'll end in a console-only 15.10
  environment.

  Update Manager/do-release-upgrade should instead follow the 14.04 ->
  14.10 -> 15.04 -> 15.10 upgrade path, while using old-
  releases.ubuntu.com[3] software source during the interim EOL'd ubuntu
  release upgrade

  ## References ##
  [1]upgrade - Can I skip over releases when upgrading? - Ask Ubuntu
       http://askubuntu.com/questions/34430/can-i-skip-over-releases-when-upgrading
  [2]Ubuntu 14.04→15.10 upgrade path testing - YouTube
       https://www.youtube.com/watch?v=p6f78HLaHmQ
  [3]EOLUpgrades - Community Help Wiki
        https://help.ubuntu.com/community/EOLUpgrades

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