[Bug 1723115] Re: do-release-upgrade -cd on xenial fails with "Parse failed on meta-release-lts-development"

[Jean-Baptiste Lallement]

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

** Changed in: ubuntu-release-upgrader (Ubuntu)
     Assignee: (unassigned) => Brian Murray (brian-murray)

** Changed in: ubuntu-release-upgrader (Ubuntu)
   Importance: High => Critical

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

** Tags added: rls-bb-incoming

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https://bugs.launchpad.net/bugs/1723115

Title:
  do-release-upgrade -cd on xenial fails with "Parse failed on meta-
  release-lts-development"

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

Bug description:
  On an up to date Xenial with Prompt=LTS

  $ do-release-upgrade -cd
  ERROR:root:parse failed for '/var/lib/update-manager/meta-release-lts-development'
  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 240, in parse
      while index_tag.step():
  SystemError: E:Unable to parse package file  (1)

  During handling of the above exception, another exception occurred:

  Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 372, in download
      self.parse()
    File "/usr/lib/python3/dist-packages/UpdateManager/Core/MetaRelease.py", line 278, in parse
      self.METARELEASE_URI)
  UpdateManager.Core.MetaRelease.MetaReleaseParseError: Unable to parse http://changelogs.ubuntu.com/meta-release-lts-development
  Checking for a new Ubuntu release
  Upgrades to the development release are only
  available from the latest supported release.

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