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How to fix GPG error NO_PUBKEY in Ubuntu

Written By Open Source For Geeks on Tuesday, Nov 01, 2016 | 08:54 AM

 
This vide shows how to fix following error - " W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 6AF0E1940624A220 " that comes up when you execute apt-get update command. For more details visit : http://opensourceforgeeks.blogspot.in/2013/04/w-gpg-error-httpppalaunchpadnet-precise.html