Public bug reported:

Binary package hint: update-manager

Could not calculate the upgrade

An unresolvable problem occurred while calculating the upgrade.

test 1

$ update-manager -d
extracting 'natty.tar.gz'
authenticate 'natty.tar.gz' against 'natty.tar.gz.gpg'
WARNING: Failed to read mirror file

test2. With apt-get

After change in sources.list maverick to natty did a update and then I
get

sudo apt-get dist-upgrade
Reading package list ... Done
Building dependency tree
Reading state information ... Done
Calculating upgrade ... Failed
The following packages have unmet dependencies:
  dbus: Depends: Upstart-job
         Depends: Upstart (> = 0.6.3-6) but will not be
installed
  HostName: Predepèn: Upstart-job
  logrotate: Depends: cron or
                      Anacron but will not be installed or
                      fcron but will not be installed
  module-init-tools: Depends: Upstart-job
  netbase: Depends: initscripts but will not be installed
            Depends: Upstart-job
            Recommends: ifupdown
  network-manager-gnome: Depends: network-manager (> =
0.8.4 ~) but will not be installed
  procps: Depends: Upstart-job
           Depends: initscripts but will not be installed
  udev: Depends: Upstart-job
  util-linux: Depends: Upstart-job
  x11-common: Depends: Upstart-job
  xserver-xorg-core: Depends: keyboard-configuration but
not be installed
E: Error, pkgProblemResolver:: Resolve generated breaks,
This can be caused by held packages.

ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: update-manager 1:0.142.23
ProcVersionSignature: Ubuntu 2.6.35-28.50-generic 2.6.35.11
Uname: Linux 2.6.35-28-generic x86_64
Architecture: amd64
Date: Mon Apr 25 02:51:26 2011
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
PackageArchitecture: all
ProcEnviron:
 PATH=(custom, no user)
 LANG=ca_ES.utf8
 SHELL=/bin/bash
SourcePackage: update-manager

** Affects: update-manager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug maverick

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https://bugs.launchpad.net/bugs/770059

Title:
  [natty] update-manager: E:Error, pkgProblemResolver::Resolve generated
  breaks, this may be caused by held packages.

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