Repair Linux Bootloader in Rescue | Servercore Documentation

Restore the Linux bootloader in Rescue

The main boot loader of Linux operating systems is GRUB.In case of problems, you can restore the boot loader using LiveCD — boot into Rescue mode.

In the Live system, you should mount all partitions to a pre-created folder, such as /mnt, similar to how they were mounted in the main system.

To restore the bootloader:

Start the system from the LiveCD.
Open the CLI.
Print information about the partitions on the available disks:
```
fdisk -l
```
Find the root partition where the system is installed. In the disk information you got in step 2, find the partition with the Linux filesystem type.The root partition is in /dev/sda*, if the partitions are on a software RAID array — /dev/md* (mount to the corresponding array).
Suppose your main system has a root partition / located in /dev/sda2 and a /boot partition located in /dev/sda1. Mount the partitions to /mnt:
```
mount /dev/sda2 /mnt/
mount /dev/sda1 /mnt/boot
```
If you are using a UEFI bootloader, mount the EFI partition:
```
mount /dev/sda3 /mnt/boot/efi
```
Specify /dev/sda3 as the EFI partition.

Use the cat /mnt/etc/fstab command to see the mount point in the host OS, as well as the UUID of the disk and match it to the UUID of the disk in the Live image.

Mount the /sys, /proc, /dev directories:

mount --bind /sys /mnt/sys
mount --bind /proc /mnt/proc
mount --bind /dev /mnt/dev