I'm trying to create a persistent live Ubuntu bootable USB drive using mkusb.
In the "Persistent live drive settings" I have the options "msdos", "upefi" and "d-n-i", and also have the buttons "Use defaults" and "OK".
Unfortunately, I couldn't find in the wiki nor the manual what each item or the "Use defaults" button does.
Clicking "Use defaults" is the same as clicking "OK" without any item selected? And what is the meaning of each item? When should (or shouldn't) each one be used?