/etc/kernel/prerm.d/last-good-boot is in grub 0.97-29ubuntu68.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 | #!/bin/sh
# Make sure a last-good-boot exists before removing any kernels.
if [ -x /usr/sbin/kernel-helper ]; then
/usr/sbin/kernel-helper -i
fi
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