LPIC-1 System Architecture Practice Question
A Linux system fails to boot after installing a new kernel. Which step should be taken first to recover the system?
⚠ Common exam trap
Test-takers frequently assume a failed kernel boot requires external recovery media (live CD or rescue mode) or single-user mode, forgetting that GRUB’s boot menu already provides direct access to the old kernel without any additional tools.
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
✓
Edit GRUB configuration at boot to select the old kernel
When a new kernel fails to boot, the quickest recovery method is to select the previous working kernel from the GRUB boot menu. GRUB typically retains the old kernel entry in its menu (e.g., 'Advanced options for Ubuntu' or a similar submenu), allowing you to boot the system without any external media or reinstallation. This approach avoids the overhead of using a live CD or rescue mode and directly restores functionality.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Edit GRUB configuration at boot to select the old kernel
Why this is correct
At GRUB menu, press 'e' to edit and change the kernel line to the old kernel.
- ✗
Reinstall the original kernel using a live CD
Why it's wrong here
Reinstalling is a last resort; you can often boot the old kernel first.
- ✗
Boot into single-user mode to fix the kernel
Why it's wrong here
Single-user mode still uses the new kernel; you need to change the kernel selection first.
- ✗
Use the rescue mode from installation media
Why it's wrong here
Rescue mode is for serious issues; try the GRUB menu first.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-1 exam.