19 Grand Unified Bootloader
The Grand Unified Bootloader (GRUB) is the first program to be started when the computer gets switched on. For BIOS computers, you can then choose between Linux and Windows from a menu. On EFI computers, this selection function no longer plays a major role. However, GRUB also takes over the task of starting Linux itself and passing various parameters to the kernel there.
Usually, GRUB is set up during the installation of the distribution and then simply works. The background information presented here is especially relevant if the boot process gets stuck for some reason.
This chapter focuses on the GRUB 2.0 version that has been available since 2012 and its use on EFI machines. At the end of the chapter, you will also ...
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