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Apt GPG Key Installation

gpg --keyserver --recv-keys xyxyxyxyxy
gpg --armor --export xyxyxyxyxy | apt-key add -
apt-get update

Replace the xyxyxyxyxy key with a valid one being required by your system.  It's shown on the error thrown when apt-get update is run.  Ex.

W: GPG error: lenny Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9AA38DCD55BE302B NO_PUBKEY 4D270DEDB40584E6