Use the bootloader EFI configuration script from Debian upstream with
slight modifications as follows:
1. apt update before installing packages
2. Install grub-efi package
3. Remove unneeded cryptsetup and keyutils packages

Side-effects: None known so far
Tested: OK
This patch alongwith commit 7b6a3ad7 close bugzilla entry: https://bugs.hamaralinux.org/show_bug.cgi?id=423