[Bug 1419564] [NEW] VM fails to start: Launch helper exited with unknown return code 1

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Today I found my VM fails to start with the following error:

Помилка під час запуску домену: Launch helper exited with unknown return
code 1

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/asyncjob.py", line 125, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1360, in startup
    self._backend.create()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 1007, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: Launch helper exited with unknown return code 1

Linux 3.19RC7 (from here: http://kernel.ubuntu.com/~kernel-ppa/mainline)
Kubuntu 14.10 x86_64
Libvirt-bin: 1.2.12-0~14.10~ppa0
Virt-manager: 1:1.1.0-1~getdeb2

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

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VM fails to start: Launch helper exited with unknown return code 1
https://bugs.launchpad.net/bugs/1419564
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