How to choose a background image for grub2

If you want a background image for grub2, first you need to change the colors and resize it (the larger the image, the longer it takes to start grub2).

convert -resize 640x480 -colors 256 image.jpg new_image.png

Now, move the image to grub folder

sudo mv new_image.png /boot/grub

And tell to grub file where  is the path to read the background image:

 sudo vim /etc/default/grub

add the following line:

GRUB_BACKGROUND=/boot/grub/new_image.png

Now, update your grub

sudo update-grub

Enjoy it!

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