Yep, You go to the teminal and type this command to
Once nemo come up with root priviledge copy which picture you want and paste it in /bootCode:pkexec nemo
Don't forget to runIn the /etc/default/file open it like thisCode:sudo update-grub
then change these linesCode:xed admin:///etc/default/grub
Also you have to changeCode:GRUB_TIMEOUT_STYLE=hidden GRUB_TIMEOUT=0 Change to GRUB_TIMEOUT_STYLE=menu GRUB_TIMEOUT=5
You may also have to change the resolution to something bigger if the print is too small to read.Code:#GRUB_GFXMODE=800x600 to GRUB_GFXMODE=800x600
save the file
and again runIf you want to change the boot order you do so by changing the number in this lineCode:sudo upgrade-grub
Remember grub starts counting a zero 0 so 0 is the first item in your boot list. 1 would be the second and so forth.Code:GRUB_DEFAULT=0
.jpeg also works, .bmp & .png will also work.
Good luck .
Followed your instructions......rebooting now.