[Bug 776038] Re: Update manager fails to dist-upgrade with IPv6-only connection

[Job Snijders]

** Tags added: lucid precise

** Tags added: ipv6

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https://bugs.launchpad.net/bugs/776038

Title:
  Update manager fails to dist-upgrade with IPv6-only connection

Status in “update-manager” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: update-manager

  A maverick install that only has an IPv6 only connection (and even an
  IPv6 mirror or apt package cache configured) will not detect the natty
  upgrade through the update manager. If you run check-new-release you
  get the right result, and if you run do-release-upgrade it knows, but
  Update manager doesn't know until you give  it a IPv4 connection and
  then have it recheck for updates. Once it knows, it will complain if
  of not being able to get the release notes if it is switched back to
  v6 only.

  To reproduce:
  Set the internet connection of a Ubuntu install that doesn't know about the Natty release to having IPv4 set to disabled. (Edit connection -> IPv4 tab -> Set menu to disabled. Apply. Reconnect.)
  Configure apt to use either an IPv6 available package cache or an IPv6 available mirror.
  Open update manager and have it check for new updates. 
  Notice that it never discovers that there's a new Natty release.
  Run check-new-release. Notice it gets the correct result.
  Enable IPv4 and recheck. You should get a message that Natty is available.
  Disable IPv4. Try to upgrade. Notice you get an error about not being able to get release notes, and you cannot complete the upgrade.

  From running wireshark, it looks like Update manager is looking for
  http://changelogs.ubuntu.com/meta-release to find out about new
  releases, which is unreachable over IPv6. That file mentions
  http://archive.ubuntu.com/ubuntu/dists/natty/main/dis-upgrade-
  all/current/ReleaseAnnouncement, which is probably where it's (trying
  to) getting release notes.

  ProblemType: Bug
  DistroRelease: Ubuntu 10.10
  Package: update-manager 1:0.142.23
  ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
  Uname: Linux 2.6.35-28-generic x86_64
  Architecture: amd64
  Date: Mon May  2 17:47:47 2011
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  PackageArchitecture: all
  ProcEnviron:
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager

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