Problems when trying to download updates

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http://www.ubuntux.org – So when I am trying to download updates through my Synaptic Package Manager, I get all the way through expect at the final file when I receive this error: GPG error: http://ppa.launchpad.net hardy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 39456311108B243FFailed to fetch http://dl.google.com/linux/deb/dists/stable/Release Unable to find expected entry main/binary-lpia/Packages in Meta-index file (malformed Release file?) Some index files failed to download, they have been ignored, or old ones used instead. I am a total Ubuntu n00b, 100% thrown into this OS without a clue as to what I'm doing which has been fun albeit challenging and so I am at a complete loss as to what this means or how to fix it. Any help is greatly appreciated. Thank you! (Distributions)