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[SOLVED] No public key error

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linux-howto

http://ubuntuforums.org – I use ubuntu 12.04. I get the following error when I sudo apt-get update Quote: Reading package lists... Done W: GPG error: http://archive.canonical.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 W: GPG error: http://archive.ubuntu.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 W: GPG error: http://archive.ubuntu.com precise-updates Release: The following signatures couldn't be verified be (Hardware)