apt-get update échoue sur Debian etch

J'ai un serveur debian sur lequel tourne Etch. Je n'arrive plus à faire fonctionner apt-get update correctement :

root@charm osqa ] apt-get update
Ign http://ftp.uk.debian.org etch Release.gpg
Ign http://ftp.uk.debian.org etch Release
Err http://ftp.uk.debian.org etch/main Packages
  404 Not Found
Err http://ftp.uk.debian.org etch/contrib Packages
  404 Not Found
Err http://ftp.uk.debian.org etch/non-free Packages
  404 Not Found
Failed to fetch http://ftp.uk.debian.org/debian/dists/etch/main/binary-i386/Packages.gz  404 Not Found
Failed to fetch http://ftp.uk.debian.org/debian/dists/etch/contrib/binary-i386/Packages.gz  404 Not Found
Failed to fetch http://ftp.uk.debian.org/debian/dists/etch/non-free/binary-i386/Packages.gz  404 Not Found
Reading package lists... Done
W: Couldn't stat source package list http://ftp.uk.debian.org etch/main Packages (/var/lib/apt/lists/ftp.uk.debian.org_debian_dists_etch_main_binary-i386_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://ftp.uk.debian.org etch/contrib Packages (/var/lib/apt/lists/ftp.uk.debian.org_debian_dists_etch_contrib_binary-i386_Packages) - stat (2 No such file or directory)
W: Couldn't stat source package list http://ftp.uk.debian.org etch/non-free Packages (/var/lib/apt/lists/ftp.uk.debian.org_debian_dists_etch_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.

Mon fichier sources.list est assez minimal, il contient juste :

###### Debian Main Repos
deb http://ftp.uk.debian.org/debian/ etch main contrib

Des indices ? Les emplacements des dépôts ont-ils changé ? Merci, Joel.