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These tools are primitive, and in some cases they can be difficult to reach, but they can be useful if you need to bypass a new system default in order to boot an OS that has the tools you need to control the boot process.
On Macs, holding the Option key (or Alt with a PC keyboard) brings up the Mac's boot manager.
Experienced multi-booters know the tools and techniques to avoid or recover from boot coups.
If you're new to the EFI world, though, most of the techniques you may know for helping with BIOS-mode booting don't apply to EFI-mode booting.
In such a case, you may be able to boot into your preferred OS on a one-time basis by using your computer's built-in boot manager, as described in the previous section. To remove GRUB, you must employ your package management system.
The trouble is that how you do this varies greatly from one computer to another. Boot0003* Windows Boot Manager HD(1,800,113000,2491a00e-2a89-4dc4-af21-34c436c8f88a)File(\EFI\Microsoft\Boot\bootmgfw.efi)WINDOWS.........x... For instance, on an RPM-based system, you might type: The details of what packages you must remove vary from one distribution to another, though.
Smith, [email protected] written: 4/24/2016; last Web page update: 10/22/2017, referencing r EFInd 0.11.2 This Web page is provided free of charge and with no annoying outside ads; however, I did take time to prepare it, and Web hosting does cost money.
Microsoft provides a way to do this in Windows 8 and later; see this How-To Geek article for documentation on how to use this feature.This page describes tools and techniques you can use to keep r EFInd set as your default boot manager, or at least to recover it as the default boot option if something else takes over.This page is organized by OS, describing the tools and techniques you can use in each OS to recover from a boot coup—or in some cases, to prevent one from occurring.For instance, you might see options to boot hard disks in BIOS/CSM/legacy mode. Such updates are relatively rare, but they can happen at any time when the distribution maintainer pushes out a version of GRUB with a bug fix.
These options might not work; and even if they do, they'll boot the computer in BIOS mode, so you won't be able to use the tools described on this page to correct your boot problems. Therefore, one way to prevent a Linux boot coup is to disable such updates.
The Installing r EFInd page describes how to install r EFInd from Linux, mac OS, Windows, or an EFI shell. One problem with disabling GRUB updates is that you'll be cut off from the benefits they bring—GRUB updates are normally distributed because they contain important bug fixes. Of course, if you're booting via r EFInd without involving GRUB, you may not care about such updates.