LPIC-1 System Architecture 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)'. What is the most likely cause?
⚠ Common exam trap
The LPIC-1 exam often tests the distinction between a missing root filesystem and a missing initrd, trapping candidates who assume the error means the root partition itself is absent, when in fact the kernel cannot access it due to missing drivers in the initrd.
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
✓
Missing or incorrect initrd
The error 'VFS: Unable to mount root fs on unknown-block(0,0)' indicates the kernel cannot locate or access the root filesystem during boot. The most common cause is a missing or incorrect initrd (initial RAM disk) that contains the necessary drivers (e.g., for SCSI, SATA, or filesystem modules) to mount the root partition. Without a proper initrd, the kernel lacks the modules to access the storage device, resulting in this panic.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Missing root filesystem
Why it's wrong here
Missing root filesystem would show a different error about mounting.
- ✗
Corrupt kernel image
Why it's wrong here
Corrupt kernel would cause earlier boot failure.
- ✗
Damaged bootloader
Why it's wrong here
Damaged bootloader would prevent kernel from loading at all.
- ✓
Missing or incorrect initrd
Why this is correct
Initrd contains drivers needed to mount root filesystem.
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JA
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.