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All boot loaders need to prevent "unclean" reboots, a potential source ofrevival in case of corrupted boot or kernel metadata. This is especiallyimportant for boot loaders built from binary blobs (ROMs) or where the boot loadersource code is difficult to reverse engineer. Even sane boot loaders riskcorrupting system memory or data if memory corruption occurs while theoperating system is executing.
The most common reason for a corrupt kernel or boot loader is usuallyhardware fault. In that case, the system will fail to load the bootloader or kernel, and your system will be unbootable - you will notsee the GRUB menu at all. You cannot get to a GRUB prompt. However, it ispossible to boot into single recovery pass, which enables the GRUBcommand line. It is also possible to load recovery pass 2, or 3, etc.,up to the last pass. The boot process of later passes is similar to theboot process of earlier passes. "Pass" refers to the increment of the GRUBcommand line after the last regular (non-multiboot) menu entry. So pass0 will show both GP and kernel, while the last pass of the GRUB command line will show only kernel.
The first recovery pass starts GRUB and boots the kernel, but does notmount hard disks. It also does not access any file system (the /boot/grub directory is empty). Thisshould be the minimum recovery pass required to get a working system.For that purpose, the following command must work: d2c66b5586