A Linux system is failing to boot with the following error: Which of the following actions will resolve this issue? (Choose two.)

Question

Exhibit

Options

• AExecute grub-install --root-directory=/mnt and reboot.
• BExecute grub-install /dev/sdX and reboot.
• CInterrupt the boot process in the GRUB menu and add rescue to the kernel line.
• DFix the partition modifying /etc/default/grub and reboot.
• EInterrupt the boot process in the GRUB menu and add single to the kernel line.
• FBoot the system on a LiveCD/ISO.

• A
  13% (3)
• B
  78% (18)
• C
  4% (1)
• D
  4% (1)

Explanation

When GRUB is corrupted or missing from the MBR, the system cannot boot on its own. The two-step recovery process is: First (F), boot from external media such as a LiveCD or ISO, which gives you a working OS environment with disk access. Then (B), execute grub-install /dev/sdX (where sdX is the target drive, e.g., /dev/sda) to reinstall GRUB to the MBR of the disk, then reboot. These two steps work together. Option A uses --root-directory=/mnt which is for chroot scenarios but does not apply cleanly without the LiveCD step first. Option C (adding 'rescue') and E (adding 'single') modify kernel boot parameters for recovery modes, but if GRUB itself is broken, the menu cannot even be reached to edit kernel lines. Option D modifies /etc/default/grub which configures GRUB options but does not reinstall a missing/corrupt bootloader.

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