So I'm trying to clone the setup of one computer to 4 identical machines on the same network. I don't fancy the idea of meddling with the insides of the computer, so I'm following the method outlined here

However, whenever I try the method outlined in the accepted answer, I get

dd: opening 'dev/sda1':Permission denied

Since the drive I'm cloning is my main partition, I'm running both machines off of live CDs. I thought it might not be working because I can't clone the drive when it's mounted, but running umount /dev/sda1 / says it's not mounted.

I'm not 100% set on using this particular method, if there's some other way that would also get the job done.