Try Following Steps
1. open Terminal
2. type sudo apt-get install grub2-splashimages
3 . after installing the above check folder /usr/share/images/grub/
4. you can add images to this folder by pasting images to this folder
for changing the permissions of the folder
5. after this type sudo gedit /etc/grub.d/05_debian_theme in terminal
6. find the line set_background_image "/usr/share/images/desktop-base/desktop-grub.png"
you can use Cntrl + F to find the line
7. change the desktop-grub.png to the filename you like and save
8. then type update-grub in the terminal
9. restart the system ,now you can see your custamised grub background
for changing again background image edit the file /boot/grub/grub.cfg
1. open Terminal
2. type sudo apt-get install grub2-splashimages
for changing the permissions of the folder
5. after this type sudo gedit /etc/grub.d/05_debian_theme in terminal
you can use Cntrl + F to find the line
8. then type update-grub in the terminal
9. restart the system ,now you can see your custamised grub background
for changing again background image edit the file /boot/grub/grub.cfg
The format of the transparent background of the image is PNG. Users who want to use quality images should convert images from jpg to png to optimize their images at: https://jpg4png.com/
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