This is going to be one of those posts that I make for my own selfish reasons. I install new boxes freqently, and one of the things I run into alot when I apt, is the error message:

WARNING: The following packages cannot be authenticated!
   <whatever I was installing>
Install these packages without verification [y/N]?

You can get rid of this message with a simple command.

apt-get install debian-archive-keyring