Linux n00b here.
I'd like to run Ubuntu in the same way I used to use knoppix ... essentially I created a liveCD with all my defaults, then put the iso on my hard drive and booted from it in a way that the liveCD ran 100% in memory. It took a while to boot, but it was fast and the most robust system in the world because I never touched the original OS other than to pull it out an into memory.
I also kept my content on another partition of the drive... it was writable. The ISO partition was not writable.
It was great as an unattended kiosk ... ultra-reliable... never bogged down (everything was in memory ... booted original image every time) ... super secure. I used it for a kiosk.
I'm sure there's a guide somewhere how to do that with ubuntu but I've searched and searched but I guess I just don't have the right terminology to find it. Any ideas?