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====== GRUB Bootloader ======

GRUB is a bootloader that supports multiple operating systems. [[https://wiki.debian.org/Grub2]]

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===== Change Timeout =====

Edit ''/etc/default/grub'' and modify ''GRUB_TIMEOUT''. You can set it as low as 0 to skip the menu.

<code bash>
GRUB_TIMEOUT=0
</code>

Then run:

<code bash>
sudo update-grub
</code>

===== Change background image =====

Set the ''GRUB_BACKGROUND'' variable in ''/etc/default/grub''.

For example, if you installed some sample images with the ''grub2-splashimages'' package (''sudo apt install grub2-splashimages''), you can find the images with ''dpkg -L grub2-splashimages'' and try them. Otherwise, make your own PNG, JPEG, or TGA file. It will scale it down automatically.

Here is an example:

<code bash>
# in /etc/default/grub:
GRUB_BACKGROUND=/usr/share/images/grub/Plasma-lamp.tga
</code>

Then run:

<code bash>
sudo update-grub
</code>

===== Change text colors =====

Add a config in ''/etc/grub.d'' to override the settings in ''/etc/grub.d/05_debian_theme''. Files are loaded from there alphabetically so you want yours to be last to override anything.

Color list is available at: [[https://www.gnu.org/software/grub/manual/grub/html_node/color_005fnormal.html#color_005fnormal]]

Example file:

<code bash 99_devdungeon>
#!/bin/sh
# /etc/grub.d/99_devdungeon
# Requires executable bit
# and then run `sudo update-grub`
# Use `black` for `menu_color_normal` for transparency if using an image background
echo "set menu_color_normal=light-cyan/dark-gray"
echo "set menu_color_highlight=dark-gray/light-cyan"
echo "set color_normal=white/black"
echo "set color_highlight=black/white"
</code>

Then run:

<code bash>
sudo update-grub
</code>

**Note**: Change the ''dark-gray'' background for ''menu_color_normal'' to ''black'' if you want it to be transparent to show an image underneath.
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