live-build-fix-shim-remove.patch

--- /usr/lib/live/build/binary_grub-efi	2019-03-11 10:05:40.000000000 +0000
+++ /usr/lib/live/build/binary_grub-efi_v2	2021-08-04 13:37:20.064547041 +0000
@@ -267,8 +267,12 @@
 		# Saving cache
 		Save_cache cache/packages.binary

-		# Removing depends
-		Remove_package
+		# Removing depends, some bootloader packages are marked as Protected/Important
+		# in Ubuntu, so temporarily add an apt flag to allow them to be removed
+		PRE_APT_OPTIONS="${APT_OPTIONS}"
+		APT_OPTIONS="${APT_OPTIONS} --allow-remove-essential"
+		Remove_package
+		APT_OPTIONS="${PRE_APT_OPTIONS}"
 		;;

 	false)