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Possible Duplicate:
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.

Community
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Rajesh
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1 Answers1

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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 :)

Caesium
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