System Rescue Mode

If the system cannot boot, the "Enable/disable rescue mode" feature grants the user access to the hard drive. 

This rescue system is built with Rescatux. Once you have enabled it and booted up, you must first locate the original hard disk by running the command:

lsblk

You will likely see hard disk devices listed, for instance /dev/sda1, which should correspond to the size of your hard disk (e.g., 50 GB).

Next, simply mount the device to a directory such as /mnt with the command:

sudo mount /dev/sda1 /mnt

Perform any necessary modifications.

When finished, be sure to turn off rescue mode.