[Bug 1730164] [NEW] failure attempting to initiate upgrade from xenial to zesty

[Robert Collins]

Public bug reported:

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.

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1730164

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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