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: You may want to run apt-get update to correct these problems

gpg --keyserver wwwkeys.eu.pgp.net --recv-keys A70DAF536070D3A1
apt-key add /root/.gnupg/pubring.gpg
apt-get update