Problem with Updates, "GPG error"

[Alcidious]

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 is not available: NO_PUBKEY 40976EAF437D05B5
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://security.ubuntu.com precise-security Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
W: GPG error: http://extras.ubuntu.com precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 16126D3A3E5C1192
W: GPG error: http://ppa.launchpad.net precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 83FBA1751378B444
W: GPG error: http://us.archive.ubuntu.com precise-proposed Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5

I also tried to update using the update manager, and I get the following error:

Requires installation of untrusted packages

The action would require the installation of packages from not authenticated sources.
----Details----
dbus dbus-x11 ghostscript ghostscript-cups ghostscript-x isc-dhcp-client isc-dhcp-common libdbus-1-3 libdbus-1-dev libgs9 libgs9-common linux-headers-3.2.0-31 linux-headers-3.2.0-31-generic-pae linux-headers-generic-pae linux-libc-dev resolvconf software-center tzdata tzdata-java

Any help is appreciated! Hopefully with this update I will have a bug-free system again (fingers crossed)

[einonm]

Did you try googling any of your errors? A simple search for your error message gave the top answer of:

http://techpad.co.uk/content.php?sid=84

Which looks promising.

[Alcidious]

By the way, looking at other posts with similar errors, I ran:

sudo apt-get update
sudo apt-get clean
cd /var/lib/apt
sudo mv lists lists.old
sudo mkdir -p lists/partial
sudo apt-get clean
sudo apt-get update

no luck

and also:

sudo aptitude -o Acquire::http::No-Cache=True -o Acquire::BrokenProxy=true update

and also no luck.

[jerrrys]

try here

http://www.googlubuntu.com/results/?...lubuntu.com%2F

[wojox]

Add the keys back:

gpg --keyserver pgpkeys.mit.edu --recv-key  40976EAF437D05B5     
gpg -a --export 010908312D230C5F | sudo apt-key add -

[Alcidious]

Sweet! Fixed, thanks y'all!