To create a UEFI live USB (running Ubuntu if that matters), my understanding is that the simplest method is to create a FAT32 partition and copy the files from the last ISO there. I would also have to mark is as
parted /dev/sdX set 1 boot on
However, what if it's an older pendrive, used as live USB with an MBR for legacy booting?
I understand that MBR and GPT are different disk layouts. Don't I have to convert from one to the other? Don't I have to destroy the previous bootloader?
Don't I have to convert this MBR disk into a GPT disk?