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 fails to boot with a kernel panic: 'Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)'. The administrator suspects the root filesystem is not being detected. Which kernel parameter should be checked first?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "first"
Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
init=/sbin/init
Why wrong: This parameter specifies the init program, not the root filesystem device.
root=/dev/sda1
The root parameter tells the kernel which device to mount as root.
ro
Why wrong: This mounts the root filesystem read-only, but does not specify the device.
panic=10
Why wrong: This sets the timeout before rebooting after a panic, unrelated to root device detection.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
root=/dev/sda1
The kernel panic 'VFS: Unable to mount root fs on unknown-block(0,0)' indicates the kernel cannot locate the root filesystem. The 'root=' kernel parameter specifies the device for the root filesystem (e.g., root=/dev/sda1). Checking this parameter first is critical because if it is missing, incorrect, or the device name is wrong, the kernel will fail to mount the root filesystem and panic.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
init=/sbin/init
Why it's wrong here
This parameter specifies the init program, not the root filesystem device.
root=/dev/sda1
Why this is correct
The root parameter tells the kernel which device to mount as root.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
ro
Why it's wrong here
This mounts the root filesystem read-only, but does not specify the device.
panic=10
Why it's wrong here
This sets the timeout before rebooting after a panic, unrelated to root device detection.
Common exam traps
The trap here is that candidates often confuse kernel parameters that affect boot behavior (like 'ro' or 'panic') with the one that actually tells the kernel where the root filesystem lives, leading them to overlook the 'root=' parameter.
Detailed technical explanation
The kernel uses the 'root=' parameter to set the 'root_dev' variable, which is used by the VFS layer to call the appropriate block device driver. If the device node (e.g., /dev/sda1) is not present in the initramfs or the kernel's compiled-in root device is wrong, the kernel falls back to 'unknown-block(0,0)'. In modern systems with dynamic device naming (e.g., UUID or PARTUUID), using 'root=UUID=...' is more reliable than a static device name like /dev/sda1.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Linux Kernel and System Startup — This question tests Linux Kernel and System Startup — Read the scenario before looking for a memorised answer..
The correct answer is: root=/dev/sda1 — The kernel panic 'VFS: Unable to mount root fs on unknown-block(0,0)' indicates the kernel cannot locate the root filesystem. The 'root=' kernel parameter specifies the device for the root filesystem (e.g., root=/dev/sda1). Checking this parameter first is critical because if it is missing, incorrect, or the device name is wrong, the kernel will fail to mount the root filesystem and panic.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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