Hi
I'm kinda new around.
But i have a little issue. I get this error:

W: GPG error: http://ftp.debian.org etch Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A70DAF536070D3A1 NO_PUBKEY B5D0C804ADB11277
W: GPG error: http://security.debian.org etch/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A70DAF536070D3A1
W: GPG error: http://security.debian.org lenny/updates Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A70DAF536070D3A1
W: You may want to run apt-get update to correct these problems

When i added these lines

deb http://security.debian.org/ etch/updates main contrib
deb-src http://security.debian.org/ etch/updates main contrib
deb http://debrepo.mirror.vpslink.com/debian etch main contrib
deb http://ftp.de.debian.org/debian etch main

to /etc/apt/sources.list
I try running apt-get update again but it gives me the same error.
Is there any way to fix this?

1) Quick and nasty fix:

gpg --keyserver pgp.mit.edu --recv-keys <key id>
gpg --export --armour <key id> | apt-key add -

2) Alternatively:

apt-key update
apt-get install debian-archive-keyring

3) Try a different mirror, or wait a few hours