Yeah, sorry, I don't think that's a reproducer for the bug. You killed
dbus, gdm and everything else, and they obligingly died on you. :)

My feeling is that this bug is about a deadlock that somehow happens
when dbus and/or systemd are reloaded, possibly at the same time. It
looks like dbus stops responding to systemd, and so when it calls
GetNameOwner() to be able to watch type=dbus units, it gets no reply and
then decides to kill all type=dbus units, which is a lot of things. If
that's right, it's most likely to be a dbus bug that it can get into
this state. But I'm personally at a bit of a loss as to how to approach
it without being able to reproduce.

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https://bugs.launchpad.net/bugs/1871538

Title:
  dbus timeout-ed during an upgrade, taking services down including gdm

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