Update from Ubuntu 11.04 to 11.10 does not work

[Markus Huber]

Trying to update Ubuntu 11.04 to 11.10. After downloading the new sources the following error pops up:

Es konnte nicht ermittelt werden, welche Systemaktualisierungen verfügbar sind

An unresolvable problem occurred while calculating the upgrade:
E:Fehler: Unterbrechungen durch pkgProblemResolver::Resolve hervorgerufen; dies könnte durch zurückgehaltene Pakete verursacht worden sein.

 This can be caused by:
 * Upgrading to a pre-release version of Ubuntu
 * Running the current pre-release version of Ubuntu
 * Unofficial software packages not provided by Ubuntu

If none of this applies, then please report this bug using the command 'ubuntu-bug update-manager' in a terminal.

Have already deactivated all sources manually, no change. Since I never had any pre-release installed and do not have any apparent package issues, I think this may be a bug.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: update-manager 1:0.150.3
ProcVersionSignature: Ubuntu 2.6.38-11.50-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
NonfreeKernelModules: fglrx
Architecture: amd64
Date: Sat Oct 15 17:34:52 2011
GConfNonDefault:
 /apps/update-manager/check_new_release_ignore=natty
 /apps/update-manager/first_run=false
 /apps/update-manager/show_details=true
 /apps/update-manager/window_size=(600,600)
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100429)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=de_DE:en
 PATH=(custom, user)
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: update-manager
UpgradeStatus: Upgraded to natty on 2011-10-15 (0 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Markus Huber (mhla)]

I might have found a solution to this.
Using

sudo apt-get dist-upgrade

I got more useful information, namely the names of the packages causing the error:

Die folgenden Pakete haben unerfüllte Abhängigkeiten:
 libgtk2-ruby1.8 : Hängt ab von: libatk1-ruby1.8 (= 0.19.3-2ubuntu1)
                   Hängt ab von: libpango1-ruby1.8 (= 0.19.3-2ubuntu1)
                   Hängt ab von: libgdk-pixbuf2-ruby1.8 (= 0.19.3-2ubuntu1)
E: Fehler: Unterbrechungen durch pkgProblemResolver::Resolve hervorgerufen; dies könnte durch zurückgehaltene Pakete verursacht worden sein.

I uninstalled these three packages (and those depending on them) in Synaptic. The dist-upgrade continues then without the error mentioned in the bug report. I do not know why I did not get this information from the Upgrade process using the GUI.

[dino99 (9d9)]

That version is no more maintained