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Fix missing Ubuntu GPG key error

You ever had a time when you were running updates on your machine and got a GPG error? You know:

sudo apt-get update
Reading package lists... Done
 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 9BDB3D89CE49EC21

Here’s how to fix it:

gpg --keyserver hkp://keyserver.ubuntu.com:80 --recv 9BDB3D89CE49EC21
gpg --export --armor 9BDB3D89CE49EC21 | sudo apt-key add -

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