Public bug reported:
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)
** Affects: update-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug natty
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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
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