[Bug 815829] Re: Doesn't report a useful error when distributions are priority pinned in apt preferences

[Sam Vilain]

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https://bugs.launchpad.net/bugs/815829

Title:
  Doesn't report a useful error when distributions are priority pinned
  in apt preferences

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

Bug description:
  Hi, every time I do a dist upgrade I run into this.  The update
  manager knows how to change the package repositories, but it should
  also check that the repositories it needs end up with a suitable
  priority as seen in 'apt-cache policy' to allow the upgrade to happen.
  Otherwise, it fails and it doesn't know why.

  This could be important if, say, some installation instructions give
  advice on how to pull in just a few packages from a newer release
  without upgrading wholesale by using release priority pinning.  The
  user doing this may not understand what is happening when following
  such instructions, and then later get a cryptic error.  As such, it
  might be useful for this check to be back-ported to the update mangers
  going back to one or more LTS releases.

  Example /etc/apt/preferences:
  # You will need to remove this (or change oneiric to psychedelic or
  # whatever Ubuntu 12.04 gets named) when you want to dist-upgrade to
  # oneiric; the do-release-upgrade script won't change it for you (or
  # know what went wrong)
  Explanation: Don't install oneiric packages by default
  Package: *
  Pin: release a=oneiric
  Pin-Priority: 99

  Explanation: Don't install natty-proposed packages by default
  Package: *
  Pin: release a=natty-proposed
  Pin-Priority: 98

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: update-manager-core 1:0.150.2
  Uname: Linux 3.0.0-rc7+ x86_64
  Architecture: amd64
  Date: Mon Jul 25 12:09:44 2011
  EcryptfsInUse: Yes
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
  ProcEnviron:
   LANGUAGE=en_NZ:en
   PATH=(custom, user)
   LANG=en_NZ.UTF-8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to natty on 2011-07-23 (1 days ago)

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