/etc/kernel/postinst.d/zz-update-grub is in grub-efi-ia32 1.99-21ubuntu3.
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 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | #! /bin/sh
set -e
which update-grub >/dev/null 2>&1 || exit 0
set -- $DEB_MAINT_PARAMS
mode="${1#\'}"
mode="${mode%\'}"
case $0:$mode in
# Only run on postinst configure and postrm remove, to avoid wasting
# time by calling update-grub multiple times on upgrade and removal.
# Also run if we have no DEB_MAINT_PARAMS, in order to work with old
# kernel packages.
*/postinst.d/*:|*/postinst.d/*:configure|*/postrm.d/*:|*/postrm.d/*:remove)
exec update-grub
;;
esac
exit 0
|