[Bug 1529079] [NEW] Can't start virtual machines after upgrade to Xenial

[RussianNeuroMancer]

Public bug reported:

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.

** Affects: libvirt (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: systemd (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: regression-release xenial

** Attachment added: "virt-manager.png"
   https://bugs.launchpad.net/bugs/1529079/+attachment/4539684/+files/virt-manager.png

** Also affects: systemd (Ubuntu)
   Importance: Undecided
       Status: New

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

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

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