The answer is to select an older kernel from the GRUB menu. This is the most efficient method because GRUB, the Grand Unified Bootloader, automatically retains previous kernel versions after an update, presenting them as separate boot entries. By choosing an older kernel at boot time, you bypass the faulty new kernel entirely, avoiding the kernel panic without needing recovery media or chroot tools. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of bootloader behavior and kernel management; a common trap is attempting to reinstall the kernel from a live CD, which is slower and unnecessary. Remember that GRUB’s menu is your first line of defense—it stores the last working kernel as a fallback. A helpful memory tip: “GRUB keeps the old, so you don’t need to be bold.”
XK0-005 Troubleshooting Practice Question
This XK0-005 practice question tests your understanding of troubleshooting. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 user reports that their system is unable to boot after a recent kernel update. The system displays a 'kernel panic' message. Which of the following is the MOST efficient way to boot into a previous kernel version?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Select an older kernel from the GRUB menu
The GRUB bootloader stores multiple kernel versions after an update, allowing you to select a previous kernel from its menu at boot time. Choosing an older kernel bypasses the faulty new kernel without requiring additional tools or recovery media, making it the most efficient method to resolve a kernel panic caused by a recent update.
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.
✓
Select an older kernel from the GRUB menu
Why this is correct
GRUB typically lists older kernel entries, allowing quick selection of a working kernel.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use the systemd rescue mode
Why it's wrong here
Rescue mode may not help with kernel panic; it provides limited recovery options.
✗
Reinstall the operating system
Why it's wrong here
Reinstalling is drastic and unnecessary; a previous kernel can be used.
✗
Boot from a live CD and chroot
Why it's wrong here
This is more invasive and time-consuming; not the most efficient method.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may overcomplicate the solution by choosing systemd rescue mode or chroot, not realizing that GRUB's menu provides the simplest and fastest way to revert to a working kernel without any additional recovery steps.
Detailed technical explanation
How to think about this question
GRUB (Grand Unified Bootloader) maintains a configuration file (typically /boot/grub/grub.cfg) that lists all installed kernels. When a kernel update runs, it does not remove the old kernel immediately; instead, it adds the new entry while keeping the old one. The kernel panic often results from a missing or incompatible module, and selecting the previous kernel avoids the issue entirely without modifying the bootloader configuration.
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: Select an older kernel from the GRUB menu — The GRUB bootloader stores multiple kernel versions after an update, allowing you to select a previous kernel from its menu at boot time. Choosing an older kernel bypasses the faulty new kernel without requiring additional tools or recovery media, making it the most efficient method to resolve a kernel panic caused by a recent update.
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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