Thanks. I don't see anything odd in those. You say you updated from 1.2.11 (from a ppa version) - could you tell us which ppa that came from?
The libvirtd.log shows 2015-02-08 23:54:01.656+0000: 12729: warning : qemuOpenVhostNet:495 : Unable to open vhost-net. Opened so far 0, requested 1 Does /dev/vhost-net exist? If not, does 'modprobe vhost_net' solve this problem? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1419564 Title: VM fails to start: Launch helper exited with unknown return code 1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/1419564/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs