[Bug 1069007] Re: do-release-upgrade and update-manager crashes on migration from ubuntu precise to ubuntu quantal at migration evaluation

[Fabio Marconi]

Thank you for taking the time to report this issue and helping to make
Ubuntu better. Examining the information you have given us, this does
not appear to be a bug report so we are closing it and converting it to
a question in the support tracker. We understand the difficulties you
are facing, but it is better to raise problems you are having in the
support tracker at https://answers.launchpad.net/ubuntu if you are
uncertain if they are bugs. You can also find help posting your problem
in the support forum of your local Ubuntu's community
http://loco.ubuntu.com/ or asking at http://askubuntu.com. For help on
reporting bugs, see https://help.ubuntu.com/community/ReportingBugs.

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Invalid

** Converted to question:
   https://answers.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+question/224728

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https://bugs.launchpad.net/bugs/1069007

Title:
  do-release-upgrade and update-manager crashes on migration from ubuntu
  precise to ubuntu quantal at migration evaluation

Status in “ubuntu-release-upgrader” package in Ubuntu:
  Invalid

Bug description:
  I have Ubuntu 12.04.01 Precise Pangolin for amd64
  At boot, update-manager starts and show "Ubuntu 12.10 Quantal Quetzal is available. Start migration."
  I start do-release-upgrade, but it crashed at "Evaluation of changes".
  do-release-upgrade is closed, and update-manager starts.
  It crashed at update check and show 1608 updates available, and crashes. It shows :
  ---------
  Impossible d'installer certaines mises à jour

  Exécutez une mise à niveau partielle pour installer autant de mises à jour que possible.
  Ceci peut être dû à une mise à niveau précédente qui n'a pas été terminée.

  ---------------------------------   ------------
  | Mise à niveau partielle |  | Fermer |
  ---------------------------------   -------------
  ---------
  I press the "partial migration" button, but the migration crashed and shows :
  ---------
  Impossible d'évaluer la mise à  niveau

  Un problème irrémédiable est survenu lors de l'évaluation de la mise à niveau :
  E:Impossible de corriger les problèmes, des paquets défectueux sont en mode "garder en l'état"

  Cela peut-être du à un paquet logiciel non officiel, non fourni par
  Ubuntu.

  Cela ressemble fort à un problème temporaire. Veuillez réessayer plus tard.
  ---------

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: ubuntu-release-upgrader-core (not installed)
  ProcVersionSignature: Ubuntu 3.5.0-10.10-generic 3.5.1
  Uname: Linux 3.5.0-10-generic x86_64
  ApportVersion: 2.0.1-0ubuntu14
  Architecture: amd64
  Date: Sat Oct 20 11:20:37 2012
  InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to precise on 2012-10-20 (0 days ago)

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