The correct answer involves checking the boot order in BIOS/UEFI and verifying the GRUB configuration. This error, "no bootable device found linux," occurs when the system’s firmware cannot locate a valid operating system on any attached storage, often because the boot sequence is misconfigured or the bootloader is missing. On the CompTIA Linux+ XK0-005 exam, this question tests your ability to distinguish between hardware-level firmware settings and software-level bootloader issues—a common trap is focusing only on disk failure when the real problem is a corrupted GRUB or a wrong boot device priority. Remember that BIOS/UEFI controls which disk the system looks at first, while GRUB is responsible for loading the Linux kernel from that disk. A useful memory tip: think of BIOS as the “which door” and GRUB as the “which key”—if either is wrong, the system won’t boot.
XK0-005 Troubleshooting Practice Question
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.
A Linux system fails to boot with the error 'No bootable device found'. Which two troubleshooting steps should be taken? (Select TWO).
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Verify the GRUB configuration
The error 'No bootable device found' indicates that the system's BIOS/UEFI cannot locate a valid bootloader or operating system on any available storage device. Verifying the boot order in BIOS/UEFI (Option E) ensures that the correct disk is set as the first boot device, which is a common cause of this error. Checking the GRUB configuration (Option D) is also critical because if GRUB is missing, corrupted, or misconfigured, the system will not find a bootable kernel, even if the disk is correctly detected.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Check the SATA cable connections
Why it's wrong here
Cable issues would typically cause disk not detected, but 'No bootable device' often indicates bootloader problem.
✗
Reinstall the kernel
Why it's wrong here
Kernel reinstallation is unnecessary and may not resolve bootloader issues.
✗
Run fsck on the root filesystem
Why it's wrong here
Filesystem checks are for corruption, not missing boot device.
✓
Verify the GRUB configuration
Why this is correct
Corrupted or missing GRUB can cause 'No bootable device' error.
Related concept
Read the scenario before looking for a memorised answer.
✓
Check the boot order in BIOS/UEFI
Why this is correct
Incorrect boot order can prevent the system from finding the boot device.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse filesystem corruption (fsck) or kernel issues with bootloader problems, but the 'No bootable device found' error specifically points to the firmware's inability to locate a bootable partition or bootloader, not to filesystem or kernel corruption.
Detailed technical explanation
How to think about this question
When a system boots, the BIOS/UEFI firmware iterates through the configured boot order list, attempting to read the Master Boot Record (MBR) or GUID Partition Table (GPT) from each device. If the first-stage bootloader (e.g., GRUB stage 1 or the UEFI boot manager) is missing or the partition containing /boot is not marked as bootable, the firmware reports 'No bootable device found'. GRUB configuration files (grub.cfg) reside in /boot/grub2/ (or /boot/grub/) and define kernel paths, initramfs, and root= parameters; a misconfigured or missing grub.cfg can cause GRUB to fail silently, leading the firmware to conclude no bootable device exists.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the XK0-005 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this XK0-005 question in full detail.
Troubleshooting — This question tests Troubleshooting — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Verify the GRUB configuration — The error 'No bootable device found' indicates that the system's BIOS/UEFI cannot locate a valid bootloader or operating system on any available storage device. Verifying the boot order in BIOS/UEFI (Option E) ensures that the correct disk is set as the first boot device, which is a common cause of this error. Checking the GRUB configuration (Option D) is also critical because if GRUB is missing, corrupted, or misconfigured, the system will not find a bootable kernel, even if the disk is correctly detected.
What should I do if I get this XK0-005 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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