This LPIC-1 practice question tests your understanding of system architecture. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A Linux system with a custom kernel fails to boot after a new kernel is compiled and installed. The boot process stops at a prompt: 'Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)'. The root filesystem is on /dev/sda2 with ext4. The system has an initramfs generated with dracut. The admin can boot from a previous kernel. Which is the most appropriate next step to troubleshoot and fix the issue? Options: A) Rebuild the initramfs using 'dracut --force --kver' with the correct kernel version, B) Add 'root=/dev/sda2' to the kernel command line, C) Use 'mkinitrd' with the '--preload' option for ext4 module, D) Run 'ldd /sbin/init' to check for missing libraries.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Rebuild the initramfs using 'dracut --force --kver' with the correct kernel version
Option A is correct because the initramfs may be missing necessary drivers for the root filesystem or controller. Regenerating it with dracut for the new kernel ensures modules are included. Option B is likely already present (the error says unknown-block, indicating root= parameter might be missing or wrong, but if it's in GRUB, it should be there). Option C uses mkinitrd which is deprecated on newer systems with dracut. Option D is for user-space issues; the panic is at boot before init runs. So A is best.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Run 'ldd /sbin/init' to check for missing libraries
Why it's wrong here
The panic occurs before init is executed; libraries are not relevant.
✓
Rebuild the initramfs using 'dracut --force --kver' with the correct kernel version
Why this is correct
Regenerates the initramfs ensuring all necessary modules are included.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use 'mkinitrd' with the '--preload' option for ext4 module
Why it's wrong here
mkinitrd is legacy; dracut is the modern tool. Also, ext4 may already be built-in.
✗
Add 'root=/dev/sda2' to the kernel command line
Why it's wrong here
The parameter is likely already present; the error indicates the kernel cannot read the device, not missing parameter.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the LPIC-1 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which LPIC-1 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
System Architecture — This question tests System Architecture — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Rebuild the initramfs using 'dracut --force --kver' with the correct kernel version — Option A is correct because the initramfs may be missing necessary drivers for the root filesystem or controller. Regenerating it with dracut for the new kernel ensures modules are included. Option B is likely already present (the error says unknown-block, indicating root= parameter might be missing or wrong, but if it's in GRUB, it should be there). Option C uses mkinitrd which is deprecated on newer systems with dracut. Option D is for user-space issues; the panic is at boot before init runs. So A is best.
What should I do if I get this LPIC-1 question wrong?
Identify which LPIC-1 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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