LPIC-1 Devices, Filesystems and FHS Practice Question
This LPIC-1 practice question tests your understanding of devices, filesystems and fhs. 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 fails to boot with the error 'Kernel panic: VFS: Unable to mount root fs on unknown-block(0,0)'. After investigation, the administrator suspects that the root filesystem device is not being detected. Which of the following is the most likely cause?
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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The root= kernel parameter points to a non-existent device
The error 'VFS: Unable to mount root fs on unknown-block(0,0)' indicates the kernel cannot locate the device specified by the 'root=' kernel parameter. If this parameter points to a non-existent device (e.g., wrong partition number or missing disk), the kernel fails to mount the root filesystem, causing a panic. This is the most direct cause among the options.
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 root filesystem is corrupted
Why it's wrong here
Corruption would typically cause a different error during mount, not 'unknown-block(0,0)'.
✗
The initrd file is missing or corrupted
Why it's wrong here
Missing initrd could cause boot issues but would not necessarily produce 'unknown-block(0,0)'; it often results in a different error.
✓
The root= kernel parameter points to a non-existent device
Why this is correct
If the root= parameter specifies a device that does not exist or is not recognized, the kernel fails with this error.
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 SATA controller driver is not included in the kernel
Why it's wrong here
Missing driver could prevent disk detection, but the error would likely indicate no block devices found, not a specific device ID.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse a missing initrd (which handles driver loading) with a root device misconfiguration, but the specific 'unknown-block(0,0)' error directly points to the root= parameter pointing to a device that does not exist, not a driver or initrd issue.
Detailed technical explanation
How to think about this question
The 'unknown-block(0,0)' error arises when the kernel's VFS layer attempts to open the device specified by the 'root=' parameter (e.g., root=/dev/sda1) but the device's major/minor numbers (0,0) indicate it is not registered in the kernel's device table. This often happens after a kernel update or disk reconfiguration where the root partition's identifier changes (e.g., from /dev/sda1 to /dev/sdb1) or when using UUID-based identification and the UUID is mistyped. The kernel uses the 'root=' parameter to call bdget() and if the device is not found, it returns the unknown-block error.
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-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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Devices, Filesystems and FHS — This question tests Devices, Filesystems and FHS — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The root= kernel parameter points to a non-existent device — The error 'VFS: Unable to mount root fs on unknown-block(0,0)' indicates the kernel cannot locate the device specified by the 'root=' kernel parameter. If this parameter points to a non-existent device (e.g., wrong partition number or missing disk), the kernel fails to mount the root filesystem, causing a panic. This is the most direct cause among the options.
What should I do if I get this LPIC-1 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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