GPG error: http://ppa.launchpad.net natty Release: The following signatures

W: GPG error: http://ppa.launchpad.net natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF0E1940624A220



gpg --keyserver keyserver.ubuntu.com --recv 0624A220

gpg --export --armor 0624A220 | sudo apt-key add -

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