live.debian.net repository GPG error

[spea- at gmx.de (spea)]

hallo,

how i can import the key and using "http://live.debian.net"; repository 
without GPG error ?

lh_build say:
...
...
P: Configuring file /etc/hostname
P: Configuring file /etc/apt/sources.list
Get:1 http://live.debian.net etch Release.gpg [189B]
Hit http://live.debian.net etch Release
Get:2 http://security.debian.org etch/updates Release.gpg [189B]
Err http://live.debian.net etch Release
Hit http://security.debian.org etch/updates Release
Get:3 http://live.debian.net etch Release [4651B]
Ign http://live.debian.net etch Release
Ign http://security.debian.org etch/updates/main Packages/DiffIndex
Ign http://live.debian.net etch/main Packages/DiffIndex
Hit http://security.debian.org etch/updates/main Packages
Ign http://live.debian.net etch/main Sources/DiffIndex
Hit http://live.debian.net etch/main Packages
Hit http://live.debian.net etch/main Sources
Get:4 http://ftp.debian.org etch Release.gpg [378B]
Hit http://ftp.debian.org etch Release
Ign http://ftp.debian.org etch/main Packages/DiffIndex
Hit http://ftp.debian.org etch/main Packages
Fetched 4842B in 0s (6198B/s)
Reading package lists... Done
W: GPG error: http://live.debian.net etch Release: The following 
signatures couldn't be verified because the public key is not available: 
NO_PUBKEY 394D199524C52AC3
W: You may want to run apt-get update to correct these problems
P: Deconfiguring file /etc/hostname
P: Deconfiguring file /etc/resolv.conf
P: Deconfiguring file /etc/hosts


# ----------------
# key import
# ----------------

# 
http://lists.alioth.debian.org/pipermail/debian-live-devel/2007-March/001035.html

pluto:~# apt-get install debian-unofficial-archive-keyring
Reading package lists... Done
Building dependency tree... Done
E: Couldn't find package debian-unofficial-archive-keyring

pluto:/# gpg --keyserver wwwkeys.eu.pgp.net --recv-keys 24C52AC3
pluto:/# gpg --armor --export 24C52AC3 | apt-key add -
pluto:/# apt-key list
/etc/apt/trusted.gpg
--------------------
pub   1024D/2D230C5F 2006-01-03 [expired: 2007-02-07]
uid                  Debian Archive Automatic Signing Key (2006) 
<ftpmaster at debian.org>

pub   1024D/6070D3A1 2006-11-20 [expires: 2009-07-01]
uid                  Debian Archive Automatic Signing Key (4.0/etch) 
<ftpmaster at debian.org>

pub   1024D/ADB11277 2006-09-17
uid                  Etch Stable Release Key 
<debian-release at lists.debian.org>

pub   1024D/24C52AC3 2007-01-24 [expires: 2008-02-01]
uid                  Debian Unofficial Archive Automatic Signing Key 
(2007) <ftpmaster at debian-unofficial.org>

pluto:~# cat /opt/debian-live/config/chroot_sources/live-backports.bootstrap
## This is a sources.list for live-helper(7) to use packages from the
## Debian Live Etch backports repository.
##
## To enable it, copy this file to your config/chroot_sources directory, 
once
## as e.g. live-backports.bootstrap and once as live-backports.binary.
##
## Remeber to add debian-unofficial-archive-keyring to your package 
selection.

# Debian Live backports for Etch
deb http://live.debian.net/debian/ etch main
deb-src http://live.debian.net/debian/ etch main
pluto:~#

pluto:~# cat /opt/debian-live/config/chroot_sources/live-backports.binary
## This is a sources.list for live-helper(7) to use packages from the
## Debian Live Etch backports repository.
##
## To enable it, copy this file to your config/chroot_sources directory, 
once
## as e.g. live-backports.bootstrap and once as live-backports.binary.
##
## Remeber to add debian-unofficial-archive-keyring to your package 
selection.

# Debian Live backports for Etch

deb http://live.debian.net/debian/ etch main
deb-src http://live.debian.net/debian/ etch main
pluto:~#

Thanks
Johann