Thanks Steven, I was able to replicate the problem here.
To fix this, comment out the "start on rcS-sulogin/stop" line from
/etc/event.d/rc-default
** Changed in: upstart (Ubuntu)
Importance: Untriaged => Medium
Assignee: (unassigned) => Scott James Remnant
Status: Confirmed => Fix Committed
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init: rc6 process (4517) killed by signal 15 when rebooting from singleuser
https://launchpad.net/bugs/60626
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