W: GPG error:

[Klaus Becker <colonius@free.fr>]

n'Abend,

apt-get update ergibt bei mir:

W: GPG error: http://www.backports.org sarge-backports Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY EA8E8B2116BA136C
W: GPG error: http://ftp.debian-unofficial.org sarge Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY F82E5CC04B2B2B9E
W: GPG error: http://debian.scribus.net stable Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY DA286F326C5F196B
W: GPG error: ftp://ftp.nerim.net sarge Release: The following signatures 
couldn't be verified because the public key is not available: NO_PUBKEY 
07DC563D1F41B907
W: You may want to run apt-get update to correct these problems

Kann mir jemand das erklären?

bye
Klaus