When you get an error about these like;

W: GPG error: http://ppa.launchpad.net lucid Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY XXXXXXXXXXXXXXXX

(X’s are characters in the lines), put these lines to the terminal;

gpg --keyserver keyserver.ubuntu.com --recv XXXXXXXX 
(These X's are the last eight character in the above error)
gpg --export --armor XXXXXXXX | sudo apt-key add - 
(These X's are the last eight character in the above error)


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