Quick Answer
The answer is that the kernel image is missing or the path in grub.cfg is incorrect. GRUB error 15 specifically means the file path specified in the boot configuration cannot be located, so after a kernel update, the most likely cause is that the new kernel image file is absent from the boot partition or the path in grub.cfg does not match the actual file location, preventing GRUB from loading the kernel. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of the GRUB boot process and the critical role of the /boot directory; a common trap is assuming the update succeeded when it actually failed to copy the kernel image or regenerate the configuration. Remember the mnemonic “Error 15: Path unseen” to recall that the file path is broken, not the kernel itself.
This XK0-005 practice question tests your understanding of troubleshooting. 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.
After updating the kernel, the system fails to boot and displays 'Error 15: File not found' from GRUB. What 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.
The GRUB configuration file is missing
Why wrong: Would show 'No such file or directory' earlier.
The kernel image is missing or the path in grub.cfg is incorrect
Correct: Error 15 means file not found, likely kernel.
The initramfs image is missing
Why wrong: Missing initrd gives a different error or kernel panic.
The hard drive has failed
Why wrong: Would show disk errors, not error 15.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
The kernel image is missing or the path in grub.cfg is incorrect
GRUB error 15 indicates that the specified file path in the GRUB configuration (grub.cfg) cannot be found. Since the error occurs after a kernel update, the most likely cause is that the new kernel image file is missing from the boot partition or the path in grub.cfg does not match the actual file location, preventing GRUB from loading the kernel.
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.
The GRUB configuration file is missing
Why it's wrong here
Would show 'No such file or directory' earlier.
The kernel image is missing or the path in grub.cfg is incorrect
Why this is correct
Correct: Error 15 means file not found, likely kernel.
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 initramfs image is missing
Why it's wrong here
Missing initrd gives a different error or kernel panic.
The hard drive has failed
Why it's wrong here
Would show disk errors, not error 15.
Common exam traps
The trap here is that candidates often confuse GRUB error 15 with a missing initramfs, but error 15 occurs specifically when the kernel image path is invalid, while a missing initramfs causes a kernel panic after the kernel starts loading.
Trap categories for this question
Command / output trap
Would show 'No such file or directory' earlier.
Detailed technical explanation
GRUB error 15 is a stage 1.5 or stage 2 error that occurs when GRUB's filesystem driver cannot locate the file specified in the 'linux' or 'kernel' directive of grub.cfg. During a kernel update, the package manager (e.g., yum or apt) may install the new kernel to /boot but fail to update the grub.cfg entry, or the old entry may point to a deleted kernel version. The error code 15 is defined in GRUB Legacy (version 0.97) and is distinct from GRUB 2's 'file not found' behavior, which uses different error codes.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Troubleshooting — study guide chapter
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FAQ
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
The correct answer is: The kernel image is missing or the path in grub.cfg is incorrect — GRUB error 15 indicates that the specified file path in the GRUB configuration (grub.cfg) cannot be found. Since the error occurs after a kernel update, the most likely cause is that the new kernel image file is missing from the boot partition or the path in grub.cfg does not match the actual file location, preventing GRUB from loading the kernel.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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