Recovery System

If your system refuses to start, the "Enable/disable rescue mode" function gives you access to the hard disk.

The configured rescue environment runs Rescatux. After turning it on, start the system—your first task is to identify the original hard disk by running:

lsblk

You'll then see disk devices like /dev/sda1, which should correspond to your hard disk's capacity (for example, 50GB).

From there, simply mount that device to a directory—such as /mnt—using the command:

sudo mount /dev/sda1 /mnt

Make any necessary changes.

When you're done, be sure to disable rescue mode.