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Tags: dual-boot   grub2  
Link: πŸ” See Original Answer on Ask Ubuntu πŸ”—

URL: https://askubuntu.com/q/822774
Title: Editing OS names in /etc/default/grub - where is the OS name read from?
ID: /2016/09/09/Editing-OS-names-in-_etc_default_grub-where-is-the-OS-name-read-from_
Created: September 9, 2016    Edited:  September 9, 2016
Upload: November 24, 2022    Layout:  post
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lsb_release is an internal command to obtain the Linux Distro and version (release number). How the command works and where it gets the information from can be duplicated by you.

In terminal type cat /proc/version:

Linux version 4.7.3-040703-generic (kernel@tangerine) (gcc version 6.2.0 20160901 (Ubuntu 6.2.0-3ubuntu11) ) #201609070334 SMP Wed Sep 7 07:36:45 UTC 2016

Ubuntu appears in /proc/version but not the way it appears on grub menus. So we move on….

Now type cat /etc/issue:

Ubuntu 16.04.1 LTS \n \l

This is where lsb_release is probably getting the Linux Distro, because Ubuntu 16.04.1 LTS is what appears on my grub menu.

Before indirectly affecting the variable $GRUB_DISTRIBUTOR (referenced in your question) by forcing /etc/issue to a different constant, consider this code within /etc/grub.d/05_debian_theme:

set_default_theme(){
	case $GRUB_DISTRIBUTOR in
		Tanglu|Ubuntu|Kubuntu)
			# Set a monochromatic theme for Tanglu/Ubuntu.
			echo "${1}set menu_color_normal=white/black"
			echo "${1}set menu_color_highlight=black/light-gray"

Changing Ubuntu to My Cool Linux might appear on the menu okay but internal grub code for themes and coloring would be broken above. Not to mention all the other β€œthings” that might break inside grub plus outside in your other applications and the OS.

Edit 1:

As I learned this morning at command-to-show-linux-version and then discovered @Zanna has already given an excellent answer above, the command lsb_release retrieves text from /etc/lsb-release.

⇧ Adding 1 to a variable doesn't work as expected (Bash arithmetic) Ubuntu fails to "Suspend"  β‡©