Instead copy grub theme to /boot during postinst

The goal is to not break ARM images using vfat for /boot while
still providing the theme in /boot so that it can be available
even when /usr/share/ is not available.

Gbp-Dch: Full

debian/kali-themes.postinst

@@ -48,8 +48,15 @@ if [ "$1" = "configure" ]; then
 	# Install remaining new files
         install_all
     fi
+    # Copy grub theme to /boot
+    mkdir -p /boot/grub/themes/kali
+    cp -r /usr/share/grub/themes/kali/* /boot/grub/themes/kali/
+    sed -i -e 's|/usr/share/grub/themes/|/boot/grub/themes/|g' \
+	/boot/grub/themes/kali/theme.txt
     # Rebuild the grub configuration with our config changes
-    update-grub || true
+    if which update-grub >/dev/null; then
+	update-grub || true
+    fi
 fi
 
 #DEBHELPER#

share/grub/themes/kali/theme.txt

@@ -1,7 +1,7 @@
 
 # Global Property
 title-text: ""
-desktop-image: "/boot/grub/themes/kali/grub-16x9.png"
+desktop-image: "/usr/share/grub/themes/kali/grub-16x9.png"
 desktop-color: "#ff0000"
 terminal-font: "Unifont Regular 16"
 terminal-left: "0"