This appears to be due to an incompatibility (in QMP parsing I assume) between libvirt and the newer 1.3.0 qemu.
I've just tested a custom libvirt 1.0.1 package, which fixed the issue. We'll need to merge the newest upstream libvirt to fix this. ** No longer affects: qemu (Ubuntu) ** Changed in: libvirt (Ubuntu) Assignee: Serge Hallyn (serge-hallyn) => (unassigned) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1102487 Title: VM won't boot after recent qemu upgrade To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1102487/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs