LPIC-1 System Architecture Practice Question
A server with UEFI firmware and GPT partitioning has a corrupted bootloader. Which command can be used to reinstall GRUB in UEFI mode?
⚠ Common exam trap
Candidates often assume `grub-install /dev/sda` works universally, but without the `--target=x86_64-efi` flag it defaults to BIOS/legacy mode, which fails on UEFI systems with GPT partitioning.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
grub-install --target=x86_64-efi /dev/sda
`grub-install --target=x86_64-efi /dev/sda` explicitly installs the GRUB EFI bootloader for a 64-bit UEFI system. On a GPT-partitioned disk with UEFI firmware, the bootloader must be installed to the EFI System Partition (ESP) using the appropriate target, and this command ensures the correct EFI binary is placed there.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
grub-install --target=x86_64-efi /dev/sda
Why this is correct
Correct for UEFI systems.
- ✗
grub-mkconfig -o /boot/grub/grub.cfg
Why it's wrong here
Regenerates config but does not install the bootloader.
- ✗
grub2-install /dev/sda
Why it's wrong here
Assumes BIOS boot; not UEFI.
- ✗
grub-install /dev/sda
Why it's wrong here
This installs GRUB to the MBR, not suitable for UEFI.
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