You need to add a hand-written menu entry that chainloads another operating system, and it must still be present after the next kernel update regenerates the GRUB 2 configuration. Where should the entry be written?
LPIC-1 Exam 101-500, objective 102. Linux installation and package management medium
Machine-checked — no person has signed for it. This question was read against the source cited below by an automated pass, which found no contradiction. That is a weaker claim than it sounds: the same kind of process wrote the question, so it can confirm its own mistake.
Treat it as a good draft rather than as settled fact, and read the source below before you rely on it. It is not used in mock exams here — only questions a person has signed for are.
How these questions are written — where each question comes from, what the verification ledger records, and what happens when one is found wrong.
The options
Correct In /etc/grub.d/40_custom
Correct. 40_custom exists to be edited: grub-mkconfig runs it like the other generator scripts and copies its menuentry blocks verbatim into the output.
Not correct At the end of /boot/grub/grub.cfg
Wrong. grub.cfg is the generated output; the next grub-mkconfig run overwrites the file and the entry disappears.
Not correct In /etc/default/grub
Wrong. That file sets shell variables such as GRUB_TIMEOUT and GRUB_CMDLINE_LINUX which influence generated entries; it cannot hold a menuentry block.
Not correct In /etc/grub.d/00_header
Wrong. 00_header is a distribution-supplied script that emits the preamble of grub.cfg and is replaced when the GRUB package is upgraded.
Why
grub-mkconfig executes the executable scripts in /etc/grub.d in numeric order and concatenates their output into grub.cfg. Files supplied by the distribution, such as 00_header and 10_linux, are overwritten on package upgrade, so local changes belong in 40_custom, whose body is passed through unchanged. The number in the name also fixes where the entry lands in the menu, which matters when GRUB_DEFAULT selects by index.
Where this comes from
- Cited
- manual page grub-mkconfig(8)
Practise this
Reading one question is not practice. The trainer will draw a short set from objective 102 and space the ones you get wrong.
More questions on this objective
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- You are laying out storage for a general-purpose Linux server. Which TWO of the following are genuine reasons to use LVM for the data filesystems rather than plain partitions? machine-checked
- Which file is the configuration file that GRUB 2 generates, and which administrators are told not to edit by hand on a typical Linux distribution? machine-checked
- You replaced the boot disk in a BIOS/MBR system and need to write the GRUB 2 boot loader into the master boot record of /dev/sda, installing the required GRUB modules under /boot. Which command does that? machine-checked
- On a GRUB 2 system whose configuration file is /boot/grub/grub.cfg, type the grub-mkconfig command — including the option and its argument — that regenerates that file. machine-checked