Use “Disks” app in Ubuntu to mount EFI partition (it won’t mount automatically upon USB drive insertion, just select the partition and click little triangle “play” icon).Ĭreate folders /efi/boot and /boot/grub on EFI partition (eject and reinsert) Copy grub, kernel+initrz and create a config file Kernel and initrd would have to be present on EFI partition, so we need to delete existing EFI partition that is too small, and make larger one: $ sudo fdisk /dev/sdb Use fdisk to delete EFI partition and create a new, larger EFI partition You can try booting from this drive, but it won’t work. Make a bootable USB with Startup Disk Creator on Ubuntuĭownload Ubuntu 18.04.1 iso and use Ubuntu “Startup Disk Creator” or see “Making a bootable USB manually” below. To run a live Ubuntu 18.04.1 USB on MacPro 1,1, one needs to add a 32-bit EFI boot loader, here is how to do it: There are other ways to boot that bypass EFI mode, but – booting in EFI mode on MacPro 1,1 allows for 2 more SATA ports (located on motherboard). Problem – MacPro 1,1 is 32-bit EFI while having 64-bit architecture.
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