Edit: /etc/kernel/postinst.d/zz-update-grub (646B)
#! /bin/sh
set -e
which update-grub >/dev/null 2>&1 || exit 0
if type systemd-detect-virt >/dev/null 2>&1 &&
systemd-detect-virt --quiet --container; then
exit 0
fi
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)
if [ -e /boot/grub/grub.cfg ]; then
exec update-grub
fi
;;
esac
exit 0