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W: GPG error: http://debian-multimedia.org etch Release: Yhe following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41M907
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apt-get install debian-archive-keyring
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gpg --keyserver hkp://wwwkeys.eu.pgp.net --recv-keys 07DC563D1F41M907
Export the key from gpg and add it to your list of trusted keys for apt with apt-key:
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gpg --armor --export 07DC563D1F41B907 | apt-key add -
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apt-get update
apt-get upgrade
apt-get clean