Command line sudo apt-get update error

I get the following error when running the above command line:

GPG error: http://ppa.launchpad.net trusty Release: The following signature could not be verified because there is no public key: NO_PUBKEY 6D1D8367A3421AFB


The solution is:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 6D1D8367A3421AFB

Just replace 6D1D8367A3421AFB with the currently present keys.

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