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[Serge Hallyn <1529079@xxxxxxxxxxxxxxxxxx>]

I still cannot reproduce this at all, even when starting VMs from virt-
manager.

Are you still able to reproduce this?  (I'm wondering whether perhaps
there was a temporary bad state of systemd and libvirt being out of sync
some magical way)

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https://bugs.launchpad.net/bugs/1529079

Title:
  Can't start virtual machines after upgrade to Xenial

Status in libvirt package in Ubuntu:
  Incomplete
Status in systemd package in Ubuntu:
  New

Bug description:
  Can't start virtual machines after upgrade to Xenial.

  On Ubuntu Server 16.04:
  # virsh start testserver
  Cannot set property Before, or unknown property.

  On Kubuntu 16.04:
  Cannot set property Before, or unknown property.
  Traceback (most recent call last):
    File "/usr/share/virt-manager/virtManager/asyncjob.py", line 89, in cb_wrapper
      callback(asyncjob, *args, **kwargs)
    File "/usr/share/virt-manager/virtManager/create.py", line 1873, in do_install
      guest.start_install(meter=meter)
    File "/usr/share/virt-manager/virtinst/guest.py", line 414, in start_install
      noboot)
    File "/usr/share/virt-manager/virtinst/guest.py", line 478, in _create_guest
      dom = self.conn.createLinux(start_xml or final_xml, 0)
    File "/usr/lib/python2.7/dist-packages/libvirt.py", line 3585, in createLinux
      if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self)
  libvirtError: Cannot set property Before, or unknown property.

  At this moment there is no libvirt or systemd-related error messages in syslog when this error appear on the screen (or virsh output). Both systems was upgraded from 15.10.
  --- 
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: amd64
  DistroRelease: Ubuntu 16.04
  Package: libvirt (not installed)
  ProcCmdline: BOOT_IMAGE=/@/boot/vmlinuz-4.3.3-040303-generic root=UUID=a100d974-72cf-44ad-acf8-6ec060b773dd ro rootflags=subvol=@Xenial quiet nomdmonddf nomdmonisw
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=C
   SHELL=/bin/bash
  Tags:  xenial
  Uname: Linux 4.3.3-040303-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  modified.conffile..etc.libvirt.qemu.networks.default.xml: [modified]
  mtime.conffile..etc.libvirt.qemu.networks.default.xml: 2015-02-27T11:49:59.773560

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