I'm trying to manually install a background image for grub on a bootable flash drive. Since the drive only boots ISO's and has no installed OS, I can't take advantage of scripts such as update-grub to do this for me and the posts regarding editing /etc/default/grub don't apply to my situation. I've seen How to put a background image on GRUB? but it doesn't apply for the reasons I've mentioned. I've managed to get all my ISO's to boot properly but I'm stuck on applying the background image. Here's the relevant section of my grub.cfg the rest is all menu entries that work properly (falling back to text mode).set timeout=10set default=0set root=(hd0,msdos1)### BEGIN background setup ###function load_video {  if [ x$feature_all_video_module = xy ]; then    insmod all_video  else    insmod efi_gop    insmod efi_uga    insmod ieee1275_fb    insmod vbe    insmod vga    insmod video_bochs    insmod video_cirrus  fi}load_videoinsmod gfxterminsmod part_msdosinsmod pngGRUB_TERMINAL=gfxtermGRUB_GFXMODE=autoGRUB_BACKGROUND=splash.png### END background setup ###The background image is a 640x480 PNG file (which I scaled to size with gimp) Using GRUB 2.02 Beta2Further research indicates that this part:GRUB_TERMINAL=gfxtermGRUB_GFXMODE=autoGRUB_BACKGROUND=splash.pnguses variables that are used by the update scripts and belong in /etc/default/grub and don't appear in this fashion in grub.cfg so I'm certain those lines at least are wrong. EDIT: I've made some adjustments but still no joy. Here's a pastebin of the relevant section (I excluded the irrelevant menu entries as they work fine in text mode and aren't the problem)
Background image manual grub.cfg
grub2
You need to add the next line to your grub.cfg before the menus. Since it is custom made and you're not going to use update-grub you shouldn't have any problem: background_image /boot/Your_image.pngNow, if you want to have a different background for your distros, you just need to add the line in the menu. For instance, this is the part where my menus start, as you can see I have a default background before the menues so that when grub starts it has a background, after that each menu/submenu has its own backgroun:background_image /boot/SolusOS-splash.pngset color_normal=white/blackset color_highlight=black/whitesubmenu Debian 8.1 -->{     submenu Debian 8.1 i386 -->{                     background_image    /boot/DebianLava-splash.png                     set iso=/boot/ISOs/debian-live-8.1.0-i386-gnome-desktop.iso          ....EDIT:Here are my search path entries (mind the uuid is my usb's ID) don't know if this might be your issue:set boot_uuid=D042-8A53    set root_uuid=D042-8A53search --fs-uuid $root_uuid --set=rootsearch --fs-uuid $boot_uuid --set=grub_bootif [ $boot_uuid == $root_uuid ]then    set grub_boot=($grub_boot)/bootelse    set grub_boot=($grub_boot)fi