Fix grub theme

iso/boot/ubuntu/grub.cfg

@@ -1,27 +1,31 @@
-set timeout=30
+if loadfont unicode ; then
+  set gfxmode=800x600
+  insmod efi_gop
+  insmod efi_uga
+  insmod video_bochs
+  insmod video_cirrus
+  insmod gfxterm
+  insmod png
+  terminal_output gfxterm
+fi
 
-loadfont unicode
+set timeout=6
 
-set theme=/boot/grub/themes/dappnode
+if background_image /boot/grub/themes/dappnode/splash.png; then
+  set color_normal=light-gray/black
+  set color_highlight=white/black
+else
+  set menu_color_normal=cyan/blue
+  set menu_color_highlight=white/blue
+fi
 
-set menu_color_normal=white/black
-set menu_color_highlight=black/light-gray
+insmod play
+play 960 440 1 0 4 440 1 # Plays sound
+set theme=/boot/grub/themes/dappnode
 
 menuentry "Install Dappnode (over Ubuntu Server)" {
-        set gfxpayload=keep
-        linux   /casper/vmlinuz autoinstall --- # Added autoinstall to make it unattended
+        set background_color=black
+        set gfxpayload=keep # Maintain the graphical resolution through the booting
+        linux   /casper/vmlinuz autoinstall vga=788 FRONTEND_BACKGROUND=dark --- # Added autoinstall to make it unattended
         initrd  /casper/initrd
-}
-grub_platform
-if [ "$grub_platform" = "efi" ]; then
-menuentry 'Boot from next volume' {
-        exit 1
-}
-menuentry 'UEFI Firmware Settings' {
-        fwsetup
-}
-else
-menuentry 'Test memory' {
-        linux16 /boot/memtest86+x64.bin
-}
-fi
+}