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.
You are a systems administrator for a company that runs a critical web server on a Linux system. The server has been running stably for months, but after a recent kernel update from version 5.10.0-8 to 5.10.0-9, the server fails to boot. The boot process starts, but after the kernel loads, the system hangs with no output on the console. You have physical access to the server and can interrupt the boot process. The server uses GRUB 2 as the bootloader and the root filesystem is on an LVM logical volume. The previous kernel (5.10.0-8) is still present in /boot. Which of the following is the best course of action to restore the server to a working state?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Interrupt the boot process at GRUB, select the advanced options, and boot the old kernel 5.10.0-8.
The server fails to boot after a kernel update, but the previous kernel is still present in /boot. By interrupting GRUB 2 at boot, selecting 'Advanced options for Ubuntu' (or similar), and booting the old kernel 5.10.0-8, you bypass the problematic new kernel without modifying the bootloader or filesystem. This is the fastest, least invasive recovery method because GRUB 2 automatically detects and lists all installed kernels in /boot, including the previous one.
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.
✓
Interrupt the boot process at GRUB, select the advanced options, and boot the old kernel 5.10.0-8.
Why this is correct
This restores functionality immediately, allowing later troubleshooting of the new kernel.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Reinstall GRUB from a live CD to fix the bootloader configuration.
Why it's wrong here
GRUB is working; the kernel itself is the issue.
✗
Boot from a live CD, chroot into the system, and reinstall the new kernel package.
Why it's wrong here
Reinstalling the same kernel may not resolve the issue if it is a bug.
✗
Boot from a live CD, chroot into the system, and rebuild the initrd for the new kernel.
Why it's wrong here
The initrd is likely not the cause; the kernel hangs without output, suggesting a kernel bug or missing driver.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume the boot process failed due to a corrupted bootloader or initrd, when in fact the kernel itself is the culprit, and the simplest recovery is to boot the previous kernel from GRUB's advanced menu.
Trap categories for this question
Command / output trap
The initrd is likely not the cause; the kernel hangs without output, suggesting a kernel bug or missing driver.
Detailed technical explanation
How to think about this question
GRUB 2 reads /boot/grub/grub.cfg, which is generated by update-grub and includes menu entries for all kernels found in /boot. When booting the old kernel, the system uses its original vmlinuz and initrd.img files, which are known to work. In real-world scenarios, kernel updates can introduce regressions (e.g., driver conflicts, hardware incompatibility, or filesystem bugs) that cause a silent hang early in the boot process, before any console output is generated.
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: Interrupt the boot process at GRUB, select the advanced options, and boot the old kernel 5.10.0-8. — The server fails to boot after a kernel update, but the previous kernel is still present in /boot. By interrupting GRUB 2 at boot, selecting 'Advanced options for Ubuntu' (or similar), and booting the old kernel 5.10.0-8, you bypass the problematic new kernel without modifying the bootloader or filesystem. This is the fastest, least invasive recovery method because GRUB 2 automatically detects and lists all installed kernels in /boot, including the previous one.
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: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
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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