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If you get an error when doing apt-get update along the lines of: 

GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY <GPG_KEY>

Then re-download and apply the GPG key as follows: 

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <GPG_KEY>


Reference

http://askubuntu.com/questions/127326/how-to-fix-missing-gpg-keys

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