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

[Brian Murray]

** Changed in: update-manager (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: update-manager (Ubuntu Cosmic)
       Status: Triaged => In Progress

** Changed in: update-manager (Ubuntu Bionic)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: update-manager (Ubuntu Cosmic)
     Assignee: (unassigned) => Brian Murray (brian-murray)

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

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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