I have been looking at Live disks with persistence and the fact that you can install Ubuntu to a Flash Drive, but there seems to be no stated way to install Ubuntu on a USB drive with persistence and a way to boot it from any EFI based computer. I have a spare 124GB Flash Drive that I would like to run as a "portable" Personal OS boot device. In short I want to be able to plug this device into any computer (specifically using EFI but BIOS support is also nice) and run a full Ubuntu distro with all of my personal files and applications on it. I recently have used the mkusb code from another post to try to accomplish this and while it was the closest to what I wanted it was only a persistent version of a Live disk (in other words it was a demo set up to run like a full os.) It was interesting, though, because it made me wonder that if there was a full iso file for the code to use instead of the Live USB iso will it create a persistent, full, boot-able, drive, or (with my current luck) end up being a disaster.
I have currently looked at nearly every main break off post similar to my question but I have not found an answer. If this question has been answered in some other forum then please send me that way so I can stop obsessing over this dumb idea that I have been trying to accomplish non-stop for 4 days. Seriously, I'm loosing sleep over this.