Needed to force install soprano-daemon and libvirtodbc0 to install cantor, even though those packages were already installed

[Lixin Chin]

* Trying to install the cantor package gives an error message about unmet dependencies:

> sudo apt-get install cantor

Reading package lists... Done
Building dependency tree
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libsoprano4 : Depends: soprano-daemon (= 2.8.0+dfsg.1-0ubuntu1) but it is not going to be installed
E: Error, pkgProblemResolver::Resolve generated breaks, this may be caused by held packages.
[1] 5411 exit 100 sudo apt-get install cantor

* Forcing the install of the dependencies causes the package to install correctly, however both dependencies were already installed on the system.

> sudo apt-get --purge install cantor soprano-daemon libvirtodbc0
Reading package lists... Done
Building dependency tree
Reading state information... Done
libvirtodbc0 is already the newest version.
libvirtodbc0 set to manually installed.
soprano-daemon is already the newest version.
soprano-daemon set to manually installed.
The following extra packages will be installed:
  cantor-backend-kalgebra cantor-backend-maxima cantor-backend-octave cantor-backend-qalculate cantor-backend-r cantor-backend-sage
  cantor-backend-scilab graphicsmagick-dbg guile-1.8-libs javahelp2 javahelp2-doc kalgebra kalgebra-common libanalitza4abi1
  libanalitzagui4abi1 libarpack2 libccolamd2.7.1 libcholmod1.7.1 libcolamd2.7.1 libcxsparse2.2.3 libflexdock-java
  libflexdock-java-demo libflexdock-java-doc libfltk1.1 libgl2ps0 libglpk0 libgraphics-magick-perl libgraphicsmagick++3 libibverbs1
  libjeuclid-core-java libjgraphx-java libjhdf5-java libjhdf5-jni libjlatexmath-fop-java libjlatexmath-java libjlatexmath-java-doc
  libjogl-java libjogl-java-doc libjogl-jni libjrosetta-java liblaf-plugin-java libmatio0 libmysqlclient-dev liboctave1
  libopenmpi1.3 libparpack2 libpvm3 libqhull5 libqrupdate1 libskinlf-java libskinlf-java-demo libtiff-opengl libtiff-tools
  libtorque2 maxima maxima-emacs maxima-share maxima-src maxima-test octave octave-common octave-doc octave-htmldoc octave-info pvm
  scilab scilab-ann scilab-cli scilab-data scilab-doc scilab-doc-fr scilab-doc-ja scilab-doc-pt-br scilab-full-bin scilab-include
  scilab-minimal-bin scilab-overload scilab-plotlib scilab-scimax scilab-scimax-doc scilab-sivp scilab-swt spell texmacs
  texmacs-common xaw3dg xfig xfig-doc xfig-libs xmaxima
Suggested packages:
  libiodbc2-dev libjlatexmath
Recommended packages:
  sagemath
The following packages will be REMOVED:
  odbcinst1debian2* unixodbc*
The following NEW packages will be installed:
  cantor cantor-backend-kalgebra cantor-backend-maxima cantor-backend-octave cantor-backend-qalculate cantor-backend-r
  cantor-backend-sage cantor-backend-scilab graphicsmagick-dbg guile-1.8-libs javahelp2 javahelp2-doc kalgebra kalgebra-common
  libanalitza4abi1 libanalitzagui4abi1 libarpack2 libccolamd2.7.1 libcholmod1.7.1 libcolamd2.7.1 libcxsparse2.2.3 libflexdock-java
  libflexdock-java-demo libflexdock-java-doc libfltk1.1 libgl2ps0 libglpk0 libgraphics-magick-perl libgraphicsmagick++3 libibverbs1
  libjeuclid-core-java libjgraphx-java libjhdf5-java libjhdf5-jni libjlatexmath-fop-java libjlatexmath-java libjlatexmath-java-doc
  libjogl-java libjogl-java-doc libjogl-jni libjrosetta-java liblaf-plugin-java libmatio0 libmysqlclient-dev liboctave1
  libopenmpi1.3 libparpack2 libpvm3 libqhull5 libqrupdate1 libskinlf-java libskinlf-java-demo libtiff-opengl libtiff-tools
  libtorque2 maxima maxima-emacs maxima-share maxima-src maxima-test octave octave-common octave-doc octave-htmldoc octave-info pvm
  scilab scilab-ann scilab-cli scilab-data scilab-doc scilab-doc-fr scilab-doc-ja scilab-doc-pt-br scilab-full-bin scilab-include
  scilab-minimal-bin scilab-overload scilab-plotlib scilab-scimax scilab-scimax-doc scilab-sivp scilab-swt spell texmacs
  texmacs-common xaw3dg xfig xfig-doc xfig-libs xmaxima
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ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: cantor (not installed)
ProcVersionSignature: Ubuntu 3.5.0-18.29-generic 3.5.7
Uname: Linux 3.5.0-18-generic x86_64
ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
Date: Tue Nov 27 11:07:24 2012
InstallationDate: Installed on 2010-04-09 (962 days ago)
InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release amd64 (20091027)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_AU
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_AU.UTF-8
 SHELL=/bin/zsh
SourcePackage: cantor
UpgradeStatus: Upgraded to quantal on 2012-10-22 (35 days ago)