This question already has an answer here:

I want to install Ubuntu like how you would to a hard drive so I can use it as a portable system. I do not want a Live install; I want something where i can install updates, install drivers, and things like that. I'm really confused because I made a persistent install using UNetBootIn in Windows thinking that would allow me to do that and yet when I booted I still saw the "Install Ubuntu 12.04 LTS" icon.

merged by terdon Feb 1 at 10:00

This question was merged with How do I install Ubuntu to a USB key? (without using Startup Disk Creator) because it is an exact duplicate of that question.