[Bug 854329] Re: race condition on shutdown with more than one DM installed

[Steve Langasek]

Yeah, don't use that script.  $UPSTART_EVENTS is the variable containing
the list of events that triggered the *start* of the job; so anything
that's 'start on [...] runlevel [...]' will always match and then we
have the same race condition all over again.

Here's an alternative that DTRT.  
post-stop script
        if [ "$UPSTART_STOP_EVENTS" = runlevel ]; then
                initctl emit desktop-shutdown
        fi
end script

Tested out here with gdm and lightdm installed; the dots-over-text error
goes away with this change.

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Title:
  race condition on shutdown with more than one DM installed

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