LPIC-2 Linux Kernel and System Startup Practice Question
This LPIC-2 practice question tests your understanding of linux kernel and system startup. 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 developer compiled a custom kernel, installed it, but the system hangs before init starts. The previous kernel works. Which step was most likely missed?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Why wrong: GRUB configuration is updated automatically when a new kernel is installed; not doing so would still allow booting the new kernel if selected.
B
Not rebuilding initramfs
The initramfs contains drivers needed early; forgetting to rebuild it is the most likely cause of the hang.
C
Not running depmod
Why wrong: depmod updates module dependencies, but modules are not loaded yet at boot; the missing initramfs is more critical.
D
Not setting the correct root filesystem
Why wrong: The root= parameter is usually set correctly in the bootloader; a missing initramfs is more common.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Not rebuilding initramfs
When a custom kernel is compiled and installed, the initramfs must be rebuilt to include the necessary kernel modules for mounting the root filesystem at boot. If the initramfs is not regenerated, the kernel may lack critical drivers (e.g., for storage controllers or filesystems), causing the system to hang before init starts because it cannot access the root device. The previous kernel works because its initramfs was built with the correct modules for that kernel version.
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.
✗
Not updating GRUB configuration
Why it's wrong here
GRUB configuration is updated automatically when a new kernel is installed; not doing so would still allow booting the new kernel if selected.
✓
Not rebuilding initramfs
Why this is correct
The initramfs contains drivers needed early; forgetting to rebuild it is the most likely cause of the hang.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Not running depmod
Why it's wrong here
depmod updates module dependencies, but modules are not loaded yet at boot; the missing initramfs is more critical.
✗
Not setting the correct root filesystem
Why it's wrong here
The root= parameter is usually set correctly in the bootloader; a missing initramfs is more common.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a kernel hang before init is due to a bootloader misconfiguration (GRUB), but the real issue is the missing initramfs, which is required to provide the drivers for the root filesystem that the kernel itself does not have built-in.
Detailed technical explanation
How to think about this question
The initramfs is a cpio archive that contains early userspace tools and kernel modules needed to mount the real root filesystem. When a custom kernel is built, modules are installed under /lib/modules/$(uname -r), but the initramfs must be regenerated (e.g., with dracut or mkinitcpio) to include those modules; otherwise, the kernel may fail to load the storage driver (e.g., for NVMe or SATA) and hang waiting for root. In real-world scenarios, forgetting to rebuild initramfs is a common pitfall when upgrading kernels via source compilation, especially on systems with non-standard storage or LVM.
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.
TExam Day Tips
→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-2 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Linux Kernel and System Startup — This question tests Linux Kernel and System Startup — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Not rebuilding initramfs — When a custom kernel is compiled and installed, the initramfs must be rebuilt to include the necessary kernel modules for mounting the root filesystem at boot. If the initramfs is not regenerated, the kernel may lack critical drivers (e.g., for storage controllers or filesystems), causing the system to hang before init starts because it cannot access the root device. The previous kernel works because its initramfs was built with the correct modules for that kernel version.
What should I do if I get this LPIC-2 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
This LPIC-2 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-2 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.