Figure 4.18 Device for Boot Loader Installation
By default, the boot menu proposed by GRUB shows all the installed Linux kernels, as well as any
other operating systems that were detected. This is why you should accept the offer to install it
in the Master Boot Record. Keeping older kernel versions preserves the ability to boot the system
if the most recently installed kernel is defective or poorly adapted to the hardware. We thus
recommend that you keep a few older kernel versions installed.