postinst is in grub-ipxe 1.0.0+git-3.55f6c88-0ubuntu1.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
# Calls update-grub for the new ipxe entry to show up in the grub menu.
set -e
if [ -e /boot/grub/grub.cfg ] && which update-grub >/dev/null 2>&1
then
update-grub || true
fi
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