update trouble

[geneh2]

I have Ubuntu 8.04 on a Dell C400 and it has been just freezing up. I run sudo apt-get update and it reads this

W: GPG error: http://packages.medibuntu.org hardy Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 2EBC26B60C5A2783


I am new so not sure what to do

[Partyboi2]

Open a terminal (Applications>Accessories>Terminal) and type or paste

sudo apt-get update && sudo apt-get install medibuntu-keyring && sudo apt-get update
This will add the gpg key.

[geneh2]

Thanks!:)