apt-get question

[Jijo Jose A <jijojose@sancharnet.in>]

hi all

i am trying to download packages from http://pandora.debian.org/debian-non-US/,
using apt-setup, it update the packages lists and after it don't work with
apt-get , the error occured like

apt-get -f install deity
Reading Package Lists... Done
Building Dependency Tree... Done
Package deity has no available version, but exists in the database.
This typically means that the package was mentioned in a dependency and
never uploaded, has been obsoleted or is not available with the contents
of sources.list
E: Package deity has no installation candidate

this will repeat on all the pakages and other ftp & http sites!! 
how can i tackle this ?
TIA
-jijo jose