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 system administrator is responsible for a production server running a custom-compiled Linux kernel version 5.15. After a routine update of the kernel source and recompilation, the server fails to boot. The error message on the console is: 'Kernel panic - not syncing: No working init found. Try passing init= option to kernel.' The administrator verifies that the root filesystem is intact by booting from a live USB and mounting the root partition. The filesystem contains the usual /sbin/init (symlinked to systemd). The administrator also checks the boot loader configuration and sees that the kernel command line includes 'root=/dev/sda1 ro'. The init binary exists and is executable. Which of the following is the most likely cause of this boot failure?
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.
The boot loader's 'initrd' directive is missing or points to a non-existent file
Without an initramfs, the kernel may fail to properly set up the root filesystem, causing 'No working init found' if the initramfs was expected to contain the init or necessary modules.
B
The kernel was compiled without support for the ext4 filesystem
Why wrong: If ext4 were not supported, the kernel would display a VFS mount error, not 'No working init found'.
C
The init binary is missing or corrupted
Why wrong: The administrator confirmed /sbin/init exists and is executable.
D
The root filesystem is corrupted and cannot be mounted properly
Why wrong: The administrator verified the root filesystem is intact by mounting it from a live USB.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The boot loader's 'initrd' directive is missing or points to a non-existent file
The error 'No working init found' indicates the kernel successfully mounted the root filesystem but could not execute the init binary. Since the administrator confirmed the init binary exists and is executable on the root partition, the most likely cause is that the kernel did not have access to the necessary drivers or modules to properly access the root filesystem at boot time. The missing or misconfigured initrd (initial RAM disk) directive means the kernel lacks the temporary root filesystem containing essential modules (e.g., storage controller drivers) needed to mount the real root filesystem, leading to the kernel falling back to a failed init search.
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.
✓
The boot loader's 'initrd' directive is missing or points to a non-existent file
Why this is correct
Without an initramfs, the kernel may fail to properly set up the root filesystem, causing 'No working init found' if the initramfs was expected to contain the init or necessary modules.
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.
✗
The kernel was compiled without support for the ext4 filesystem
Why it's wrong here
If ext4 were not supported, the kernel would display a VFS mount error, not 'No working init found'.
✗
The init binary is missing or corrupted
Why it's wrong here
The administrator confirmed /sbin/init exists and is executable.
✗
The root filesystem is corrupted and cannot be mounted properly
Why it's wrong here
The administrator verified the root filesystem is intact by mounting it from a live USB.
Common exam traps
Common exam trap: answer the scenario, not the keyword
LPI often tests the misconception that 'No working init found' always means the init binary is missing or corrupted, when in fact it often results from the kernel being unable to access the root filesystem due to a missing initrd or missing storage drivers.
Detailed technical explanation
How to think about this question
The initrd (or initramfs) is loaded by the boot loader (e.g., GRUB) and contains kernel modules (e.g., for SATA, NVMe, or filesystem drivers) that are not compiled into the kernel itself. When the initrd is missing, the kernel may still mount the root filesystem if the necessary drivers are built-in, but if they are modules (common in custom kernels), the kernel cannot access the storage device and fails to find init. Real-world scenarios include kernel upgrades where the initrd is not regenerated (e.g., missing 'mkinitcpio' or 'dracut' run), or when the boot loader configuration (e.g., grub.cfg) points to an old or deleted initrd file.
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: The boot loader's 'initrd' directive is missing or points to a non-existent file — The error 'No working init found' indicates the kernel successfully mounted the root filesystem but could not execute the init binary. Since the administrator confirmed the init binary exists and is executable on the root partition, the most likely cause is that the kernel did not have access to the necessary drivers or modules to properly access the root filesystem at boot time. The missing or misconfigured initrd (initial RAM disk) directive means the kernel lacks the temporary root filesystem containing essential modules (e.g., storage controller drivers) needed to mount the real root filesystem, leading to the kernel falling back to a failed init search.
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.
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Question Discussion
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