/etc/event.d/last-good-boot is in grub 0.97-29ubuntu66.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | # last-good-boot
#
# Saves the last booted kernel
description "last kernel saver"
author "Ben Collins <ben.collins@canonical.com>"
start on runlevel 2
exec /usr/sbin/kernel-helper -u
|