This file is indexed.

postinst is in grub-efi-amd64-signed 1.93+2.02-2ubuntu8.

This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.

The actual contents of the file can be viewed below.

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#! /bin/sh
set -e

config_item ()
{
    if [ -f /etc/default/grub ]; then
	. /etc/default/grub || return
	for x in /etc/default/grub.d/*.cfg; do
	    if [ -e "$x" ]; then
		. "$x"
	    fi
	done
    fi
    eval echo "\$$1"
}

case $1 in
    configure)
	bootloader_id="$(config_item GRUB_DISTRIBUTOR | tr A-Z a-z | \
			 cut -d' ' -f1)"
	if [ "$bootloader_id" ] && [ -d "/boot/efi/EFI/$bootloader_id" ]; then
	    grub-install
	fi
	;;
esac



exit 0