I've been running a live CD of Ubuntu 12.04 for more than a few days now, reading and reading, but I'm not really understanding things when it comes to setting up FDE on Ubuntu 12.04 Precise. I'm sure for the majority of Ubuntu users, it must be quite a simple task. Full disk encryption sounds like a really smart thing to do for security reasons and all.
I'd eventually like to do something like this: http://www.death-zone.org/luks/lukstool though I am not sure if it is possible with Ubuntu. but my aim is to first get the basics down and then attempt to do the more advanced stuff.
Have a look at this: http://www.death-zone.org/index.php?option=content&task=category§ionid=2&id=42&Itemid=76 It's the blog entry that explains the process behind the linked script above.