debian:/usr/src/linux# apt-get update
Get:1 http://ftp2.de.debian.org etch Release.gpg [378B]
Ign http://ftp2.de.debian.org contrib Release.gpg
Hit http://ftp2.de.debian.org etch Release
Ign http://ftp2.de.debian.org contrib Release
Ign http://ftp2.de.debian.org etch/main Packages/DiffIndex
Ign http://ftp2.de.debian.org etch/main Sources/DiffIndex
Ign http://ftp2.de.debian.org contrib/non-free Packages
Ign http://ftp2.de.debian.org contrib/non-free Sources
Hit http://ftp2.de.debian.org etch/main Packages
Hit http://ftp2.de.debian.org etch/main Sources
Err http://ftp2.de.debian.org contrib/non-free Packages
  404 Not Found
Err http://ftp2.de.debian.org contrib/non-free Sources
  404 Not Found
Fetched 1B in 31s (0B/s)
Failed to fetch http://ftp2.de.debian.org/debian/dists/contrib/non-free/binary-i386/Packages.gz  404 Not Found
Failed to fetch http://ftp2.de.debian.org/debian/dists/contrib/non-free/source/Sources.gz  404 Not Found
Reading package lists... Done
W: Couldn't stat source package list http://ftp2.de.debian.org contrib/non-free Packages (/var/lib/apt/lists/ftp2.de.debian.org_debian_dists_contrib_non-free_binary-i386_Packages) - stat (2 No such file or directory)
W: You may want to run apt-get update to correct these problems
E: Some index files failed to download, they have been ignored, or old ones used instead.
debian:/usr/src/linux#

si asta e in :

# See sources.list(5) for more information, especialy
# Remember that you can only use http, ftp or file URIs
# CDROMs are managed through the apt-cdrom tool.
#deb http://http.us.debian.org/debian stable main contrib non-free
#deb http://security.debian.org stable/updates main contrib non-free

# Uncomment if you want the apt-get source function to work
#deb-src http://http.us.debian.org/debian stable main contrib non-free
#deb-src http://non-us.debian.org/debian-non-US stable/non-US main contrib non-f$
deb http://ftp2.de.debian.org/debian/ etch main
deb-src http://ftp2.de.debian.org/debian/ etch main

deb http://ftp2.de.debian.org/debian/ contrib non-free
deb-src http://ftp2.de.debian.org/debian/ contrib non-free