can't shutdown/reset/stop

Mar 19, 2018
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I was trying to boot a VM from a Centos live CD, and ended up with a "No DEFAULT or UI configuration directive found" and a "boot:" prompt on the console.

Nothing I can do via the GUI will allow me to reset/shutdown this VM. Shutdown just sits there waiting and waiting. And I suspect that because shutdown is trying to shutdown, reset and stop give errors:

trying to acquire lock...
TASK ERROR: can't lock file '/var/lock/qemu-server/lock-2210.conf' - got timeout

How do I kill this VM?