[Bug 1798618] Re: confusing error message with 'do-release-upgrade -d' and Prompt=lts

[Brian Murray]

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

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

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

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

** Tags added: bionic rls-dd-incoming

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https://bugs.launchpad.net/bugs/1798618

Title:
  confusing error message with 'do-release-upgrade -d' and Prompt=lts

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

Bug description:
  On a bionic system with Prompt=lts set in /etc/update-manager/release-
  upgrades, 'do-release-upgrade -d' fails with:

  $ sudo do-release-upgrade -d 
  Checking for a new Ubuntu release
  Upgrades to the development release are only 
  available from the latest supported release.
  $ echo $?
  1
  $

  The refusal to upgrade is correct, but the message it gives is
  incorrect and gives no hint how to fix.

  Since bionic is the latest release listed in https://changelogs.ubuntu.com/meta-release-lts *and* in https://changelogs.ubuntu.com/meta-release-lts-development, a more accurate explanation would be: 
     There is no development version of an LTS release available.
     To upgrade to the latest non-LTS development release, set Prompt=normal.

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