[Bug 917173] Re: lucid -> precise upgrade failed: Resolver failed to calculate the upgrade - dpkg-dev held back

[Colin Watson]

Although I haven't been able to apt-clone this yet due to apt-cacher-ng
bizarrely not liking one of the gazillion packages it wants to install,
it seems very suspicious to me that libc6:i386 ends up with a score of
-17473.  My reading of the scoring algorithm is that no package should
ever be able to get a score less than -2.  I think what we're seeing
here is signed short overflow, so apt scores libc6 extremely low when it
should be scored extremely high.  I strongly suspect that converting the
scores from signed short to signed int, although it would use a few more
kilobytes of memory, will fix this bug.

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https://bugs.launchpad.net/bugs/917173

Title:
  lucid -> precise upgrade failed: Resolver failed to calculate the
  upgrade - dpkg-dev held back

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

Bug description:
  lucid to precise i386 daily upgrade testing

  Upgrade fails with "pkgProblemResolver::Resolve generated breaks, this
  may be caused by held packages."

  From apt.log
  Investigating (9) dpkg [ i386 ] < 1.15.5.6ubuntu4.5 -> 1.16.1.2ubuntu5 > ( admin )
  Broken dpkg:i386 Breaks on dpkg-dev [ i386 ] < 1.15.5.6ubuntu4.5 -> 1.16.1.2ubuntu5 > ( utils ) (< 1.15.8)
    Considering dpkg-dev:i386 29 as a solution to dpkg:i386 7205
    Upgrading dpkg-dev:i386 due to Breaks field in dpkg:i386
  Investigating (9) dpkg-dev [ i386 ] < 1.15.5.6ubuntu4.5 -> 1.16.1.2ubuntu5 > ( utils )
  Broken dpkg-dev:i386 Depends on libdpkg-perl [ i386 ] < none -> 1.16.1.2ubuntu5 > ( perl ) (= 1.16.1.2ubuntu5)
    Considering libdpkg-perl:i386 12 as a solution to dpkg-dev:i386 29
    Holding Back dpkg-dev:i386 rather than change libdpkg-perl:i386

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: update-manager 1:0.156
  ProcVersionSignature: Ubuntu 3.2.0-8.15-generic 3.2.0
  Uname: Linux 3.2.0-8-generic x86_64
  ApportVersion: 1.90-0ubuntu2
  Architecture: amd64
  Date: Mon Jan 16 14:54:05 2012
  EcryptfsInUse: Yes
  GsettingsChanges:
   com.ubuntu.update-manager first-run false
   com.ubuntu.update-manager launch-time 1325663980
   com.ubuntu.update-manager show-details true
   com.ubuntu.update-manager window-height 671
   com.ubuntu.update-manager window-width 600
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: update-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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