This easily reproduces in a VM with

  sudo apt-get install libvirt-bin
  sudo apt-get install --reinstall libvirt-bin

During the second operation you can see this in the journal:

Jan 15 12:39:43 autopkgtest systemd[1]: Stopped Stop Active Libvirt
Guests.

/var/lib/dpkg/info/libvirt-bin.prerm has

# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ]; then
        deb-systemd-invoke stop libvirt-guests.service >/dev/null
fi
[...]
# Automatically added by dh_systemd_start
if [ -d /run/systemd/system ] && [ "$1" = remove ]; then
        deb-systemd-invoke stop libvirt-guests.service >/dev/null
fi
# End automatically added section
# Automatically added by dh_installinit
if ([ -x "/etc/init.d/libvirt-guests" ] || [ -e "/etc/init/libvirt-guests.conf" 
]) && \
   [ "$1" = remove ]; then
        invoke-rc.d libvirt-guests stop || exit $?
fi

which is unconditionally run regardless of the operation. So this
explains why libvirt-guests get stopped. So the prerm needs to be fixed.
This sounds like a bug in dh_systemd_start --no-restart-on-upgrade.

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https://bugs.launchpad.net/bugs/1533839

Title:
  vms shutting down on libvirt upgrade

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