synaptic doesn't start menu repositories

[Done]

Binary package hint: synaptic

Hola, en español, en synaptic en modo grafico al intentar abrir la opcion de repositorios esta no se ejecuta, al mirar la consola me arroja el siguiente error:

Traceback (most recent call last):
  File "/usr/bin/software-properties-gtk", line 104, in <module>
    app = SoftwarePropertiesGtk(datadir=data_dir, options=options, file=file)
  File "/usr/lib/python2.6/dist-packages/softwareproperties/gtk/SoftwarePropertiesGtk.py", line 75, in __init__
    SoftwareProperties.__init__(self, options=options, datadir=datadir)
  File "/usr/lib/python2.6/dist-packages/softwareproperties/SoftwareProperties.py", line 83, in __init__
    self.reload_sourceslist()
  File "/usr/lib/python2.6/dist-packages/softwareproperties/SoftwareProperties.py", line 521, in reload_sourceslist
    self.distro.get_sources(self.sourceslist)
  File "/usr/lib/python2.6/dist-packages/aptsources/distro.py", line 90, in get_sources
    raise NoDistroTemplateException("Error: could not find a "
aptsources.distro.NoDistroTemplateException: Error: could not find a distribution template

ProblemType: Bug
Architecture: i386
DistroRelease: LinuxMint 7
NonfreeKernelModules: nvidia
Package: synaptic 0.62.5ubuntu3
ProcEnviron:
 LANG=es_CO.UTF-8
 SHELL=/bin/bash
SourcePackage: synaptic
Uname: Linux 2.6.28-13-generic i686
UnreportableReason: Este no es un paquete LinuxMint genuino

[Marc Deslauriers (mdeslaur)]

Thanks for taking the time to report this bug and helping to make Ubuntu better. We appreciate the difficulties you are facing, but this appears to be a "regular" (non-security) bug. I have unmarked it as a security issue since this bug does not show evidence of allowing attackers to cross privilege boundaries nor directly cause loss of data/privacy. Please feel free to report any other bugs you may find.

[Kenyon Ralph (kralph)]

Thank you for taking the time to report this bug and trying to help make Ubuntu better. However, it seems that you are not using a software package provided by the official Ubuntu repositories, but by LinuxMint. Because of this the Ubuntu project can not support or fix your particular bug. Please report this bug to the provider of the software package. Thanks!

If you are interested in learning more about software repositories and Ubuntu the following pages should be informative:

1. http://www.ubuntu.com/community/ubuntustory/components - information about Ubuntu repositories
2. https://help.ubuntu.com/community/Repositories - information regarding managing repositories