HowTo:Install Sabnzbd, Sickbeard & CouchPotato on ReadyNASO6

Great guide, I've followed it a couple of times, but other tinkering had led to need to rebuild my box.

when executing...
apt-get -qy install apt-utils nano dialog whiptail

I get...

Reading package lists...
Building dependency tree...
Package apt-utils is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package apt-utils has no installation candidate
nas-EA-8B-F6:~# apt-get -qy install apt-utils nano dialog whiptail
Reading package lists...
Building dependency tree...
Package apt-utils is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package apt-utils has no installation candidate

I'm sure I need to add a source, here is the /etc/apt/sources.lst file, should I just uncomment out the debian.org entry?
deb http://www.readynas.com/packages 4.2.24/

#deb http://archive.debian.org/debian etch main