XK0-006 Troubleshooting Practice Question
A system fails to boot with a kernel panic. The administrator wants to recover by accessing a root shell. Which THREE methods can be used to achieve this?
⚠ Common exam trap
Test-takers frequently confuse the GRUB command line with a Linux shell, mistakenly thinking filesystem repair commands like fsck can be run directly from GRUB, or they may think removing 'quiet' alone grants root access when it only affects verbosity.
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
✓
Append 'single' to the kernel command line in GRUB
Appending 'single' to the kernel command line in GRUB instructs the kernel to boot into single-user mode, which provides a root shell without requiring a password. This is a standard method for recovering from a kernel panic by allowing the administrator to repair filesystems or troubleshoot boot issues.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Run 'fsck /dev/sda1' from the GRUB command line
Why it's wrong here
GRUB cannot run fsck; it's not a full shell.
- ✓
Append 'single' to the kernel command line in GRUB
Why this is correct
Boots into single-user mode.
- ✗
Press 'e' in GRUB and remove 'quiet'
Why it's wrong here
Removing quiet only shows verbose output, does not give root shell.
- ✓
Append 'rd.break' to the kernel command line in GRUB
Why this is correct
Breaks before root filesystem is mounted, giving a shell.
- ✓
Boot from a live CD and chroot into the installed system
Why this is correct
Live CD provides a working environment; chroot accesses installed system.
Go deeper
Related to this question
Learn chapter
User and Group Administration
Key term
User
A user is any person, system, or device that interacts with an IT service, resource, or identity system, typically authenticated through credentials and authorized to perform specific actions.
Key term
Shell
A shell is a computer program that provides a user interface to access an operating system's services, typically by accepting text commands.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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