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GPG error: http://extras.ubuntu.com natty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192

I think I selected to install things from extras.ubuntu.com when I used the expert mode installer, but I got the above error when doing apt-get update. How do I fix this?

marked as duplicate by Seth, Eric Carvalho, Luis Alvarado Aug 8 '13 at 15:56

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  • Official repositories like "Ubuntu Extras" are actually linked and have packages. To install this pubkey, merely run apt-get install ubuntu-extras-keyring (You can find others with a command like apt-cache search repo |grep .-keyring which also works for Debian) – Adam Katz Oct 7 '15 at 23:26
gpg --keyserver keyserver.ubuntu.com --recv 3E5C1192
gpg --export --armor 3E5C1192 | sudo apt-key add -
sudo apt-get update

This could be a solution. From


You can also get all launchpad keys automatically using the below method

sudo add-apt-repository ppa:nilarimogard/webupd8
sudo apt-get update
sudo apt-get install launchpad-getkeys
sudo launchpad-getkeys


Ubuntu Extras keyring error

  • 1
    Had the same problem as above on my 11.10 laptop. What's more, I had an annoying red triangle right next to my battery indicator. Tried a few other suggestions around the internet, but this worked great. – thebretness Dec 13 '11 at 4:47
  • Wow, that was easy.. I've tried at least 10 other solutions that did nothing if not harm my machine. – Jacksonkr Dec 9 '16 at 18:42

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