Same thing happend to me a few minutes ago.
In fact, the single-mode boot didn't finish ok or there's something
broken with the single-user mode: cursor keys, backspace and the typical
position shortcuts on the command line didn't work, and I couldn't bring
the network interface up.
** Changed in: upstart (Ubuntu)
Status: Unconfirmed => Confirmed
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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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