Apt-get :: instaling nepenthes

hi all i have a problem instaling nepenthes on dsl when i try apt-get install nepenthes i get the following error

Reading Package Lists...
Building Dependency Tree...
Package nepenthes 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 nepenthes has no installation candidate

plz help me.

ps: ia am a noob to linux

original here.