Comment 10 for bug 1068555

@Mike: you have obviously problems with other packages in your system too. Can you please try to uninstall 'libqtgui4:i386' and/or 'libtiff4:i386'? This will at least reveal the packages which triggered the installation of them. (I suspect a proprietary application, e.g. game.) Don't necessarily execute the remove, just investigate what packages are holding these problematic packages in your system.