I have tried to create an live USB installation that has the casper-rw partition instead of the carper-rw file which is limited to only 4GB. A casper-rw partition is pretty much limited to the size of your USB drive. I have tried to follow a couple tutorials where you delete the casper-rw file and it should default to the casper-rw partition; however, I cannot get this to work. Is this something that does not work in newer Ubuntu released? Thanks!
Edit: I have used and not had success using startup disk creator (Ubuntu) and Unetbootin.