[Bug 1022102] Re: Can not update the system. Get an error "Unable to mark upgrades."

[Daniel Hartwig]

Wesley, your issue is unrelated to the original reported here (though
the symptoms are similar).  It _may_ be a bug and so require it's own
report.  As your report contains details only of aptitude's behaviour,
please note that safe-upgrade is not guaranteed to find any solution and
it is *not* a bug simply because it fails and you must use full-upgrade.
However, if apt-get upgrade finds an upgrade path given the same
situation then this has grounds to be looked at.

If you experience the problem in other programs also (such as muon) then
it is not likely to be a bug in either, but rather to do with some
combination of your configuration, the archive, and the particular
relationships between the packages involved.

** Changed in: aptitude (Debian)
       Status: New => Invalid

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Title:
  Can not update the system. Get an error "Unable to mark upgrades."

Status in “apt” package in Ubuntu:
  Invalid
Status in “aptitude” package in Debian:
  Invalid

Bug description:
  When updating in the UI (Muon) I get an error dialog saying

  Unable to Mark Upgrades
  Not all packages could be marked for upgrade.
  ...

  Updating on the command line fails, too:

  sudo aptitude safe-upgrade
  Resolving dependencies...                
  Unable to resolve dependencies for the upgrade: no solution found.
  Unable to safely resolve dependencies, try running with --full-resolver.

  
  $ sudo aptitude safe-upgrade --full-resolver
  The following packages will be upgraded: 
    linux-generic linux-headers-generic{b} linux-image-generic{b} 
  3 packages upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  Need to get 5,252 B/6,960 B of archives. After unpacking 0 B will be used.
  The following packages have unmet dependencies:
   linux-headers-generic : Depends: linux-headers-3.2.0-27-generic which is a virtual package.
   linux-image-generic : Depends: linux-image-3.2.0-27-generic which is a virtual package.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: muon-updater 1.3.1-0ubuntu2
  ProcVersionSignature: Ubuntu 3.2.0-26.41-generic 3.2.19
  Uname: Linux 3.2.0-26-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.0.1-0ubuntu11
  Architecture: amd64
  Date: Sat Jul  7 09:38:47 2012
  ExecutablePath: /usr/bin/muon-updater
  InstallationMedia: Kubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101008)
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: muon
  UpgradeStatus: Upgraded to precise on 2012-05-07 (61 days ago)

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