Binary package “makebootfat” in ubuntu oracular
Utility to create a bootable FAT filesystem
Makebootfat is a command line utility able to create bootable USB disks
using the FAT filesystem and syslinux.
.
Makebootfat is the most advanced tool available able to make bootable
USB disks. It is able to autodetect/
disk in a single step without any user interaction. It's also able to
create disk images which are compatible with all the three standards
USB-FDD, USB-HDD and USB-ZIP at the same time.