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How do I fix the GPG error “NO_PUBKEY”?

I am new to Ubuntu and am having troubles Updating. Here is the error I'm receiving:

W:GPG error: http://ppa.launchpad.net maverick Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 5A9BF3BB4E5E17B5
W:Failed to fetch http://ppa.launchpad.net/ailurus/ppa/ubuntu/dists/oneiric/main/source/Sources 404 Not Found
W:Failed to fetch ...

Can someone please help me figure out what my problem is and how I might correct it?

Please note: This involves two different PPA's within the error results stated.

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marked as duplicate by Jorge Castro, jrg Feb 24 '12 at 21:15

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
By the comment above YOU are running maverick and want to install a oneiric PPA. Oneiric Source DOES NOT EXIST in that PPA any way. Do you also have "E:" errors with comments too. It would be most helpful if you would post the entire failed errors comment as the result of this "sudo apt-get update" –  Ringtail Feb 21 '12 at 3:20

1 Answer 1

This means you are missing a public key which apt-get uses to verify the authenticity of a package list. Basically, that the packages you're about to download really were published by the people you think they were (by the look of it, this is a Chromium key, you have a Chromium PPA active right?)

This command will add the key you've referenced (enter it into Terminal):

sudo apt-key adv --recv-keys --keyserver keyserver.ubuntu.com 5A9BF3BB4E5E17B5

And then the NO_PUBKEY problem should go away. As to the rest of it, you'll probably have to paste it all instead of cutting it short :)

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