Eadz, going to the link in your post, it suggests to add a few sites to your upfate/upgrade file, I added one, and the first apt- anything caused an error that you need to resolve something with the site, I am quite sure I added the site correctly, but had to comment the site out because it caused any apt-get to crash...
This is the entry:
# Security updates for "unstable" user inserted per SecurityHOWTO
# AptGet warnings on the below path REMOVED by user until resolved
#deb
http://security.debian.org unstable/updates main contrib non-free
Cuddles