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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?

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1 Answer

up vote 4 down vote accepted 
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

http://www.ubuntugeek.com/fix-for-gpg-error-httpextras-ubuntu-com-maverick-release.html

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

From

Ubuntu Extras keyring error

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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

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