Error al recuperar archivos Kubuntu 13.10

W: No se pudo obtener http://archive.canonical.com/dists/saucy/Release No se pudo encontrar la entrada esperada 'partner] / binary-amd64 / Packages' en el archivo de publicación (entrada incorrecta de fuentes.lista o archivo con formato incorrecto)

W: Error al recuperar http: //archive.canonical.com/dists/$(lsb_release/-sc)/binary-amd64/Packages 404 No encontrado [IP: 91.189.92.150 80]

W: no se pudo obtener http: //archive.canonical.com/dists/$(lsb_release/partner/binary-amd64/Packages 404 no encontrado [IP: 91.189.92.150 80]

W: Error al recuperar http: //archive.canonical.com/dists/$(lsb_release/-sc)/binary-i386/Packages 404 No encontrado [IP: 91.189.92.150 80]

W: no se pudo obtener http: //archive.canonical.com/dists/$(lsb_release/partner/binary-i386/Packages 404 no encontrado [IP: 91.189.92.150 80]

E: Algunos archivos de índice no se pudieron descargar. Han sido ignorados, o se han usado los viejos en su lugar.

Sigo recibiendo esto cuando lo hago sudo apt-get update. ¿Qué podría estar causándolo?

También tengo problemas para encontrar Skype para Kubuntu 13.10 ya que no puedo encontrarlo en ningún lado. o no está disponible?

Tengo las siguientes entradas, en mi archivo /etc/apt/sources.list:

  deb http://us.archive.ubuntu.com/ubuntu/ saucy main restricted 
  deb-src http://us.archive.ubuntu.com/ubuntu/ saucy main restricted 

  ## Major bug fix updates produced after the final release of the
  ## distribution.
  deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates main restricted 
  deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-updates main restricted 

  ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu
  ## team. Also, please note that software in universe WILL NOT receive any
  ## review or updates from the Ubuntu security team.
  deb http://us.archive.ubuntu.com/ubuntu/ saucy universe 
  deb-src http://us.archive.ubuntu.com/ubuntu/ saucy universe 
  deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates universe 
  deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-updates universe 

  ## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 
  ## team, and may not be under a free licence. Please satisfy yourself as to 
  ## your rights to use the software. Also, please note that software in 
  ## multiverse WILL NOT receive any review or updates from the Ubuntu
  ## security team.
  deb http://us.archive.ubuntu.com/ubuntu/ saucy multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ saucy multiverse 
  deb http://us.archive.ubuntu.com/ubuntu/ saucy-updates multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-updates multiverse 

  ## N.B. software from this repository may not have been tested as
  ## extensively as that contained in the main release, although it includes
  ## newer versions of some applications which may provide useful features.
  ## Also, please note that software in backports WILL NOT receive any review
  ## or updates from the Ubuntu security team.
  deb http://us.archive.ubuntu.com/ubuntu/ saucy-backports main restricted universe multiverse 
  deb-src http://us.archive.ubuntu.com/ubuntu/ saucy-backports main restricted universe     multiverse 

  deb http://security.ubuntu.com/ubuntu/ saucy-security main restricted 
  deb-src http://security.ubuntu.com/ubuntu/ saucy-security main restricted 
  deb http://security.ubuntu.com/ubuntu/ saucy-security universe 
  deb-src http://security.ubuntu.com/ubuntu/ saucy-security universe 
  deb http://security.ubuntu.com/ubuntu/ saucy-security multiverse 
  deb-src http://security.ubuntu.com/ubuntu/ saucy-security multiverse 

  ## Uncomment the following two lines to add software from Canonical's
  ## 'partner' repository.
  ## This software is not part of Ubuntu, but is offered by Canonical and the
  ## respective vendors as a service to Ubuntu users.
  deb http://archive.canonical.com/ubuntu/ saucy partner  
  deb-src http://archive.canonical.com/ubuntu/ saucy partner 

  ## This software is not part of Ubuntu, but is offered by third-party
  ## developers who want to ship their latest software.
  deb http://extras.ubuntu.com/ubuntu/ saucy main 
  deb-src http://extras.ubuntu.com/ubuntu/ saucy main 

Debes copiar esto en tu archivo /etc/apt/sources.lust y tirar lo que tenías antes. Quizás, tal vez adapte los repositorios regionales (nosotros ...) a su país, pero aún funcionará incluso en la forma actual. Además, aquí encontrarás Skype.