This file is indexed.

/sbin/update-grub is in grub 0.97-29ubuntu66.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
#
# Wrapper to warn user about kernel-img.conf move
#

if grep -q '  */sbin/update-grub$' /etc/kernel-img.conf 2> /dev/null ; then
	cat >&2 <<EOF
Your /etc/kernel-img.conf needs to be updated. Read grub's NEWS.Debian[1]
file and follow its instructions.

 1. /usr/share/doc/grub/NEWS.Debian.gz


EOF
fi

if [ -x /usr/sbin/update-grub ]; then
	exec /usr/sbin/update-grub "$@"
else
	echo "Your /usr is broken, please fix it before call this wrapper!" >&2
fi