Today I found a lot of errors when I was updating. So I went through the process of getting them fixed.

Here are the GPG Numbers:

1. 4874D3686E80C6B7
2. 6AF0E1940624A220
3. 60D11217247D1CFF

To fix these problems you need to check a couple of things:

1. When you update you use the terminal using the command: sudo apt-get update
2. If you see errors with GPG Keys just follow this advice

WARNING USE AT YOUR OWN RISK!

gpg --keyserver keyserver.ubuntu.com --recv [GPGKEY]
gpg –export –armor [GPGKEY] | sudo apt-key add -
sudo apt-get update

Use the source  listed above and use the keys that are BADSIG or NO_PUBKEY

This should work for Ubuntu 8.10 as it did work for me.

Source

Ryan Orser