This file is indexed.

/usr/bin/mkbimage 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/bash -e
cat << EOF
This program is broken, unsupported upstream, and has been deprecated in favour
of grub-mkrescue (grub-pc package).
EOF
exit 0