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[ubuntu] Problem with Updates, "GPG error"

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linux-howto

http://ubuntuforums.org – Running Ubuntu 12.04 32-bit on a samsung laptop. I am trying to update my kernel in order to install the kernel with the fix (3.2.31, i think). But whenever I try to run sudo apt-get update I get the following error: Fetched 154 kB in 2s (60.9 kB/s) Reading package lists... Done W: GPG error: http://us.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://us.archive.ubuntu.com precise-updates Release: The following signatures couldn't be verified because the public key (Hardware)