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[SOLVED] NO PUBLICKEY error ?

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linux-howto

http://ubuntuforums.org – When I tried to install some packages I'm getting the following message: Reading package lists... W: GPG error: http://cran.cnr.Berkeley.edu lucid/ Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9 What does this mean and what do I do about it ? I assume it means the packages didn't download ? (Hardware)