APT: Public Key is missing? How to fix?

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http://serverfault.com – I updated my sources.list with deb http://repo.percona.com/apt squeeze main deb-src http://repo.percona.com/apt squeeze main and called gpg --keyserver subkeys.pgp.net --recv-keys 1C4CBDCDCD2EFD2A The Result was, that it seemed to import something, so the key was found on this sever!? Nevertheless now I get the error: GPG error: http://repo.percona.com squeeze Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1C4CBDCDCD2EFD2A 1.) How can I disable/ignore the keychecking in apt in general? 2.) What is the adviced way to fix th (HowTos)