![]() ![]() There are other scenarios for booting Ubuntu. rEFInd instructs the firmware to boot Ubuntu from a linux formatted partition.A driver is installed by rEFInd that allows the firmware (and thus rEFInd) to read linux formatted partitions.There is also option with rEFInd to do a Grubless boot of Ubuntu. Ubuntu is also made the default operating system to boot. The shim boot loader boots Grub from the EFI partition.The shim boot loader is booted from the EFI partition by the firmware.The user chooses Ubuntu from the Startup Manager.The user holds down the option key at startup until the firmware boots to the Mac Startup Manager.Grub boots Ubuntu from a linux formatted partition.The firmware boots GRUB from the EFI partition.rEFInd instructs the firmware to boot Grub.The user chooses Ubuntu from the rEFInd menu.Installing Ubuntu to the internal drive of the newest Macs may not yet be possible. ![]() ![]() If you lower the security, then you can install and boot with or without using rEFInd. So with secure boot enabled, you can not install Ubuntu. Also, you can not boot the Ubuntu Live USB flash drive to install Ubuntu. If you employ all the security offered by the T2 chip, then you can not boot Ubuntu. ![]()
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