[ubuntu-ar] Problemas con instalar paquetes en debian 6.0.6 squeeze LXDE

[Henry Linux]

hola, tengo problemas en debian 6.0.6 es mi primera vez con debian he
usado *ubuntu y slackware pero no se si algo hago mal o es un problema
de configuracion
el asunto que no puedo instalar ningun paquete de ningun tipo

este es mi source.list

# deb cdrom:[Debian GNU/Linux 6.0.7 _Squeeze_ - Official i386 xfce+lxde-CD Bin$

deb cdrom:[Debian GNU/Linux 6.0.7 _Squeeze_ - Official i386 xfce+lxde-CD Binar$

deb http://security.debian.org/ squeeze/updates main
deb http://ftp.debian.org/ squeeze/contrib non-free
deb-src http://security.debian.org/ squeeze/updates main
deb http://www.debian-multimedia.org stable main
# squeeze-updates, previously known as 'volatile'
# A network mirror was not selected during install.  The following entries
# are provided as examples, but you should amend them as appropriate
# for your mirror of choice.
#
deb http://ftp.debian.org/debian/ squeeze-updates main
# deb-src http://ftp.debian.org/debian/ squeeze-updates main

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Henry.