Ccrunch hola , ¿Qué repositorios tienes en /etc/apt/sources.list? , yo tengo los siguientes repos :
#oficiales
deb http://ftp.es.debian.org/debian/ wheezy main non-free contrib
deb-src http://ftp.es.debian.org/debian/ wheezy main non-free contrib
#seguridad
deb http://security.debian.org/ wheezy/updates main contrib non-free
deb-src http://security.debian.org/ wheezy/updates main contrib non-free
#Debian proposed updates
deb http://ftp.es.debian.org/debian/ testing-proposed-updates main contrib non-free
deb-src http://ftp.es.debian.org/debian/ testing-proposed-updates main contrib non-free
#Debian Multimedia
#deb http://www.deb-multimedia.org testing main contrib non-free
## CRUNCHBANG
## Compatible with Debian Wheezy, but use at your own risk.
deb http://packages.crunchbang.org/waldorf waldorf main
#deb-src http://packages.crunchbang.org/waldorf waldorf main
## DEBIAN OFICIAL
deb http://ftp.fr.debian.org/debian/ wheezy main contrib non-free
#deb-src http://ftp.fr.debian.org/debian/ wheezy main contrib non-free
## DEBIAN SECURITY
deb http://security.debian.org/ wheezy/updates main contrib non-free
#deb-src http://security.debian.org/ wheezy/updates main contrib non-free
## DEBIAN BACKPORTS
deb http://ftp.fr.debian.org/debian/ wheezy-backports main contrib non-free
#deb-src http://ftp.fr.debian.org/debian/ wheezy-backports main contrib non-free
## Multimedia
## Instalar key # apt-get install deb-multimedia-keyring
deb http://www.deb-multimedia.org wheezy main non-free
Y luego Instalar :
apt-get install deb-multimedia-keyring
Si dices a lo de arriba que sí , eliminarás tú s.o.