For some reason your preseed didn't make my trusty mini-iso happy, but I was able to reproduce with another.
I'm marking Triaged since I reproduced it, however I still don't believe this is a bug in libvirt or qemu. The question really is what you can do to catch the fact that the host has rebooted, right? ** Changed in: libvirt (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1329254 Title: VMs do not become inactive during the reboot on saucy and later hosts To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1329254/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs