LPIC-1 Administrative Tasks Practice Question
A Linux system fails to boot with the error 'Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)'. Which of the following is the most likely cause?
⚠ Common exam trap
Candidates often confuse the 'unknown-block(0,0)' error with a bootloader misconfiguration (Option D) or a corrupted filesystem (Option A), but the key is that the error specifically indicates the kernel cannot identify the block device at all, not that it found the wrong device or that the filesystem is unreadable.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The kernel lacks the necessary driver for the storage controller
The error 'VFS: Unable to mount root fs on unknown-block(0,0)' indicates that the kernel cannot find or access the root filesystem. This typically occurs when the kernel lacks the necessary driver (module) for the storage controller (e.g., SATA, SCSI, NVMe) that the root device is connected to. Without the driver, the kernel cannot communicate with the storage hardware, resulting in the unknown-block(0,0) identifier.
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 has a corrupted superblock
Why it's wrong here
Corrupted superblock would cause filesystem errors, not VFS unable to mount.
- ✗
The initrd file is missing or corrupted
Why it's wrong here
Missing initrd usually causes 'No init found' or kernel panic earlier.
- ✓
The kernel lacks the necessary driver for the storage controller
Why this is correct
Kernel cannot access the root device due to missing storage driver.
- ✗
The bootloader configuration points to the wrong partition
Why it's wrong here
Wrong partition would often cause 'Root filesystem not found' but with a different error.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 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-1 exam.