postinst is in libpam-systemd 204-5ubuntu20.
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 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 | #! /bin/sh
set -e
pam-auth-update --package
# upgrading from pre-204 needs a reboot due to changed cgroup layout,
# restarting logind after the upgrade would lose all existing sessions
if dpkg --compare-versions "$2" lt-nl 204 &&
[ -x /usr/share/update-notifier/notify-reboot-required ]; then
/usr/share/update-notifier/notify-reboot-required
fi
# Automatically added by dh_installinit
if [ -x "/etc/init.d/systemd-logind" ] || [ -e "/etc/init/systemd-logind.conf" ]; then
if [ ! -e "/etc/init/systemd-logind.conf" ]; then
update-rc.d systemd-logind defaults >/dev/null
fi
invoke-rc.d systemd-logind start || exit $?
fi
# End automatically added section
# Automatically added by dh_installinit
update-rc.d -f systemd-logind remove >/dev/null || exit $?
# End automatically added section
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