LPIC-1 Devices, Filesystems and FHS Practice Question
During boot, a Linux system displays '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
Many candidates confuse 'unknown-block(0,0)' with a missing root= parameter or a corrupted filesystem, but the error specifically indicates the kernel cannot find the block device at all, which is almost always a missing storage driver.
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 'unknown-block(0,0)' indicates the kernel cannot find a device to mount as root. This typically occurs when the kernel lacks the driver for the storage controller (e.g., SATA, NVMe, SCSI host adapter) needed to access the root filesystem. Without the driver, the kernel cannot enumerate the block device, even if the root= parameter is correct and the filesystem is intact.
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 and needs fsck.
Why it's wrong here
Corruption usually leads to 'fsck' errors, not unknown-block.
- ✓
The kernel lacks the necessary driver for the storage controller.
Why this is correct
Missing driver prevents accessing the root filesystem.
- ✗
The root= parameter in the boot loader points to a non-existent device.
Why it's wrong here
Would show 'no such device' or 'unknown device'.
- ✗
The initrd is missing or corrupted.
Why it's wrong here
Missing initrd causes 'Kernel panic: No init found'.
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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.