This led to the creation of special Ubuntu installation ISO files designed to install a BIOS booting GRUB. However, these models could BIOS boot 64 bit operating systems. This prevented the EFI booting of 64 bit operation systems (including OS X). When Apple started building Intel Macs with 64 bit processors, most (if not all) models contained firmware with 32 bit EFIs. If the OP assumes the UEFI boot method has been removed, then the only remaining boot method must be by using a BIOS. "UEFI removed in order to be able to boot on Macs" I make the BIOS boot assumption based the the following phase from the OP's question: In other words, Intel Macs can not BIOS boot from flash drives. When first posted in 2013, this question never received an answer, because there is no answer. Note: Assume that I do not want to keep anything on the Mac, the USB has to be bootable and any use of DVD drive is excluded. So, how can I create an USB disk that will install Ubuntu on Mac, preferably latest version Ubuntu. Tried with both Ubuntu ISOs and none of them works, it does run and creates the USB disc but it's not recognized by Mac EFI or rEFInd.
Tryed YUMI with mac blend of the ISO and it produces a disc that is recognized by rEFInd but that gives "Missing Operating System" when trying to load it.It seems that the latest ISO of Ubuntu that has the UEFI removed in order to be able to boot on Macs is 12.04.3
I am planning to make this a quick guide, so others will not loose precious time encountering the same problems as me. It seems that there are several problems releated to incompatibilities between Apple-EFI and UEFI that do prevent Apple users from easily using USB drives to install or even run other operating systems.
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