Thank you Seth Arnold for your quick answer.
I have tried your sugestion but an error mesage comes now from 
`/var/lib/dpkg/status'; acording to the mesage, the error is  on the field 
`Configured-Version'.

Part of error mesage is:

"dpkg: error: al analizar el fichero `/var/lib/dpkg/status' cerca de la lĂ­nea 
4649 paquete 'ipython':
  Campo `Configured-Version' para un paquete con Status no apropiado
E: Sub-process /usr/bin/dpkg returned an error code (2)"

Paragraf of /var/lib/dpkg/status where it is supposed the problem
------------------------------------------------------------------------
Package: ipython
Status: install ok installed
Priority: optional
Section: python
Installed-Size: 2672
Maintainer: Ubuntu Developers <[email protected]>
Architecture: all
Version: 0.12.1+dfsg-0ubuntu1.1
Config-Version: 0.12.1+dfsg-0ubuntu1
Depends: python-configobj, python-decorator, python-pexpect, 
python-simplegeneric, python2.7, python (>= 2.7.1-0ubuntu2), python (<< 2.8)
Suggests: ipython-doc, ipython-notebook, ipython-qtconsole, python-argparse, 
python-matplotlib, python-numpy, python-profiler, python-zmq (>= 2.0.10.1)
Description: enhanced interactive Python shell
 IPython can be used as a replacement for the standard Python shell,
 or it can be used as a complete working environment for scientific
 computing (like Matlab or Mathematica) when paired with the standard
 Python scientific and numerical tools. It supports dynamic object
 introspections, numbered input/output prompts, a macro system,
 session logging, session restoring, complete system shell access,
 verbose and colored traceback reports, auto-parentheses, auto-quoting,
 and is embeddable in other Python programs.
 .
 This package contains the basic terminal shell. For the qt console
 install ipython-qtconsole and for the html notebook install
 ipython-notebook.
Homepage: http://ipython.org/
Original-Maintainer: Debian Python Modules Team 
<[email protected]>
------------------------------------------------------------------


Trying to solving the problem I uninstalled Python but it was a BIG MISTAKE 
because the system crashed. Fortunatly I could recoveried.

 I think, all the problem really began when I tried to change Python 2.7
to Python 3. Actually, I could not, and now I decided to keep the 2.7
version but  the system does not allow to install  new programs.

Thanks again

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https://bugs.launchpad.net/bugs/1352972

Title:
  package ipython 0.12.1+dfsg-0ubuntu1 failed to install/upgrade:
  subprocess new pre-removal script returned error exit status 1

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