Remove duplicated grub background file

debian/kali-themes.postinst

@@ -129,8 +129,6 @@ if [ "$1" = "configure" ]; then
     fi
     # Copy grub theme to /boot
     mkdir -p /boot/grub/themes/kali
-    # Remove old symlink created by postinst in 2020.3.0
-    rm -f /boot/grub/themes/kali/background.png
     cp -r /usr/share/grub/themes/kali/* /boot/grub/themes/kali/
     # Set grub theme background
     # Use background with 16x9 aspect ratio for efi installations detected
@@ -138,10 +136,9 @@ if [ "$1" = "configure" ]; then
     # necessary account for grub being the active bootloader).
     if dpkg-query --list grub-efi* | grep -v "^... grub-efi[^[:space:]]*-bin" | grep -q "^[ih][HUFWti] " ; then
         echo "grub-efi* packages found, using 16/9 as default grub background ratio"
-        cp /boot/grub/themes/kali/grub-16x9.png /boot/grub/themes/kali/background.png
     else
         echo "No grub-efi* package found, using 4/3 as default grub background ratio"
-        cp /boot/grub/themes/kali/grub-4x3.png /boot/grub/themes/kali/background.png
+        sed -i 's/grub-16x9\.png/grub-4x3.png/' /boot/grub/themes/kali/theme.txt
     fi
     # Rebuild the grub configuration with our config changes
     if which update-grub >/dev/null; then

share/grub/themes/kali/theme.txt

@@ -1,7 +1,7 @@
 
 # Global Property
 title-text: ""
-desktop-image: "background.png"
+desktop-image: "grub-16x9.png"
 desktop-color: "#2f5595"
 terminal-font: "Unifont Regular 16"
 terminal-left: "0"