Solve GPG error of ppa.launchpad.net
Perhaps you've received a warning like this once, executing the command sudo apt-get update:
Reading package lists... Done
W: GPG error: http://ppa.launchpad.net intrepid Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ...
W: You may want to run apt-get update to correct these problems
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