if with Debian testing we add the repository http://www.debian-multimedia.org it could happen that at the first apt-get update you get a GPG error:
W: GPG error: http://www.debian-multimedia.org squeeze Release:
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 07DC563D1F41B907
To solve this problem just install the debian-keyring package
# apt-get install debian-keyring
and then run this command:
# gpg --keyring /usr/share/keyrings/debian-keyring.gpg -a --export 07DC563D1F41B907 |apt-key add -
next time you update apt-get you will no longer get the GPG error.
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