Comment 0 for bug 2019089

Initially reported @ https://github.com/GoogleCloudPlatform/guest-agent/issues/119

It is only relevant for Ubuntu 22.04 and later.

The previous logic https://git.launchpad.net/ubuntu/+source/google-guest-agent/tree/debian/rules#n20 in the package works fine in 20.04 and 18.04 but not in 22.04+.

Basically anytime the google-guest-agent package is updated, these services are restarted which means the customer scripts are run at a time they are not supposed to be. This caused an outage for one customer who had some logic in their shutdown script that basically turned off their services.

The issue is most certainly in the autogenerated preinst script which should not be there. Stopping the shutdown service will invoke the shutdown script. This wasn't there in previous Ubuntu versions.

Ubuntu 22.04 preinst script
```
#!/bin/sh
set -e
# Automatically added by dh_installdeb/13.6ubuntu1
dpkg-maintscript-helper rm_conffile /etc/defaults/instance_configs.cfg 20200617.00-0ubuntu2\~ -- "$@"
# End automatically added section
# Automatically added by dh_installsystemd/13.6ubuntu1
if [ -z "${DPKG_ROOT:-}" ] && [ "$1" = upgrade ] && [ -d /run/systemd/system ] ; then
deb-systemd-invoke stop 'google-shutdown-scripts.service' 'google-startup-scripts.service' >/dev/null || true
fi
# End automatically added section
```

Ubuntu 20.04 preinst script

```
root@ubu2004:/tmp/DEBIAN# cat preinst
#!/bin/sh
set -e
# Automatically added by dh_installdeb/12.10ubuntu1
dpkg-maintscript-helper rm_conffile /etc/defaults/instance_configs.cfg 20200617.00-0ubuntu2\~ -- "$@"
# End automatically added section
```

One reason this issue was of concern as the latest google-guest-agent update was a rebuild promoted by golang-1.18 being updated to address CVEs prompting a rebuild of all packages dependant on golang-1.18 and publication of those rebuilds to the -security pocket. unattended-upgrades then upgraded google-guest-agent in the background which restarted the shutdown-scripts.