LPIC-1 Linux Installation and Package Management Practice Question
Network Topology
Refer to the exhibit. After modifying /etc/default/grub to enable serial console output, which command must be run to apply the changes to the GRUB configuration?
⚠ Common exam trap
It's easy for candidates to confuse commands that modify GRUB's runtime behavior (like `grub-set-default` or `grub-editenv`) with the command that regenerates the static configuration file from the template, leading them to pick a wrong option that does not actually apply changes from `/etc/default/grub`.
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
✓
update-grub
The correct command is `update-grub` (or its equivalent `grub-mkconfig -o /boot/grub/grub.cfg`). After modifying `/etc/default/grub`, you must regenerate the GRUB configuration file (`grub.cfg`) to incorporate the new serial console settings. `update-grub` is a wrapper that runs `grub-mkconfig` and writes the output to the correct location, applying the changes.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
grub-editenv
Why it's wrong here
This edits the GRUB environment block, not the main config.
- ✗
grub-install
Why it's wrong here
This installs GRUB to MBR or GPT, not regenerate config.
- ✗
grub-set-default
Why it's wrong here
This sets the default boot entry, doesn't rebuild config.
- ✓
update-grub
Why this is correct
This runs grub-mkconfig to generate grub.cfg from /etc/default/grub and /etc/grub.d/.
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Senior Network & Security Engineer · founder of Courseiva
This LPIC-1 practice question is part of Courseiva's free LPI certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LPIC-1 exam.