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

[Launchpad Bug Tracker]

This bug was fixed in the package update-manager - 1:19.04.2

---------------
update-manager (1:19.04.2) disco; urgency=medium

  * UpdateManager/Core/MetaRelease.py: set prompt in MetaReleaseCore so that
    do-release-upgrade can provide more informative error messages.
    (LP: #1798618, LP: #1795024)

 -- Brian Murray <brian at ubuntu.com>  Wed, 28 Nov 2018 09:49:44 -0800

** Changed in: update-manager (Ubuntu)
       Status: In Progress => Fix Released

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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:
  In Progress
Status in update-manager package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Triaged
Status in update-manager source package in Bionic:
  New

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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