Quick Answer
The answer is `systemd.unit=rescue.target`. When a kernel panic occurs immediately after GRUB, the system crashes during the early boot process, meaning the root filesystem may be corrupted or a critical service is failing. Adding this parameter to the kernel line at the GRUB prompt instructs systemd to boot into the rescue target, which mounts the root filesystem read-only and starts only the most essential services, giving you a minimal shell to diagnose and repair the issue without triggering the panic again. On the CompTIA Linux+ XK0-005 exam, this scenario tests your understanding of systemd targets versus runlevels; a common trap is confusing `rescue.target` with `emergency.target`—rescue mounts the root filesystem and starts basic services, while emergency gives you a bare shell without mounting anything. Remember the mnemonic: “Rescue reads the root, emergency is empty.”
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 and displays a kernel panic immediately after the GRUB menu. The administrator needs to boot into a rescue environment. Which GRUB boot parameter should the administrator add to the kernel line?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
single
Why wrong: Legacy runlevel, not the preferred systemd method.
init=/bin/bash
Why wrong: Bypasses init, not recommended for rescue.
systemd.unit=rescue.target
Boots into systemd rescue target.
quiet splash
Why wrong: Hides boot messages, does not change runlevel.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
systemd.unit=rescue.target
Option C is correct because when a Linux system experiences a kernel panic immediately after GRUB, the administrator needs to boot into a minimal rescue environment that loads essential system services. The `systemd.unit=rescue.target` parameter tells systemd to start the rescue target, which mounts the root filesystem and starts only the most basic services, allowing the administrator to diagnose and repair the system. This is the proper GRUB kernel parameter for systemd-based distributions to enter a rescue shell without fully booting into the default multi-user or graphical target.
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.
single
Why it's wrong here
Legacy runlevel, not the preferred systemd method.
init=/bin/bash
Why it's wrong here
Bypasses init, not recommended for rescue.
systemd.unit=rescue.target
Why this is correct
Boots into systemd rescue target.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
quiet splash
Why it's wrong here
Hides boot messages, does not change runlevel.
Common exam traps
The trap here is that candidates confuse the legacy SysVinit `single` parameter or the direct `init=/bin/bash` shortcut with the correct systemd-based rescue target, not realizing that modern distributions require the `systemd.unit=` syntax to properly initialize the rescue environment with necessary services and filesystem mounts.
Detailed technical explanation
Under the hood, systemd uses target units to define system states; `rescue.target` is a special target that pulls in `sysinit.target` and `basic.target` but stops short of `multi-user.target`, ensuring that critical filesystems are mounted and essential services like `systemd-journald` are running. In contrast, `init=/bin/bash` sets the kernel's `init` parameter to a shell, which means no init system runs, so systemd's dependency resolution and service activation are completely skipped, often leaving `/` mounted read-only and requiring manual remounting. A real-world scenario where this distinction matters is when a filesystem corruption causes a kernel panic during the pivot to the real root; using `systemd.unit=rescue.target` allows systemd to attempt to mount the root filesystem with recovery options, whereas `init=/bin/bash` might fail to mount it at all.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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.
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: systemd.unit=rescue.target — Option C is correct because when a Linux system experiences a kernel panic immediately after GRUB, the administrator needs to boot into a minimal rescue environment that loads essential system services. The `systemd.unit=rescue.target` parameter tells systemd to start the rescue target, which mounts the root filesystem and starts only the most basic services, allowing the administrator to diagnose and repair the system. This is the proper GRUB kernel parameter for systemd-based distributions to enter a rescue shell without fully booting into the default multi-user or graphical target.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
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