[Bug 1730163] Re: failure attempting to initiate upgrade from xenial to zesty

[Brian Murray]

The file /etc/update-manager/release-upgrades has "Prompt=lts" set,
while if you want to upgrade to Zesty, not an LTS, you'll need to have
"Prompt=normal".

The issue with failing to parse meta-release-lts-development has also
been reported in bug 1723115.

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https://bugs.launchpad.net/bugs/1730163

Title:
  failure attempting to initiate upgrade from xenial to zesty

Status in update-manager package in Ubuntu:
  New

Bug description:
  The docs
  https://wiki.ubuntu.com/ZestyZapus/ReleaseNotes#Upgrading_from_Ubuntu_16.10
  say to use do-release-upgrade but:

  $ sudo do-release-upgrade
  Checking for a new Ubuntu release
  No new release found.

  Asking for a development version instead throws a traceback:

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

  Asking for a proposed version also finds no version.
  $ sudo do-release-upgrade -p
  Checking for a new Ubuntu release
  No new release found.

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