Sorry, but seems I fount a new bug:

apport-collect 1387140
ERROR: Could not import module, is a package upgrade in progress?  Error: No 
module named PyQt4.QtCore

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https://bugs.launchpad.net/bugs/1387140

Title:
  Linux 3.18: VM fails to start because of unactive virtual network

Status in “libvirt” package in Ubuntu:
  Confirmed
Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Since Linux 3.18 my VM fails to start. Trying it in virt-manager
  causes error message:

  Error during domain starting: Requested operation is not valid:
  network 'default' is not active

  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 999, in create if 
ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
  libvirtError: Requested operation is not valid: network 'default' is not 
active

  Trying to start Virtual Network in connection parameters causes
  another error:

  Помилка під час спроби запуску мережі «default»: internal error:
  Failed to apply firewall rules /sbin/iptables --table filter --insert
  FORWARD --in-interface virbr0 --jump REJECT: iptables: No
  chain/target/match by that name.

  
  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/network.py", line 104, in start 
self._backend.create()
    File "/usr/lib/python2.7/dist-packages/libvirt.py", line 2820, in create if 
ret == -1: raise libvirtError ('virNetworkCreate() failed', net=self)
  libvirtError: internal error: Failed to apply firewall rules /sbin/iptables 
--table filter --insert FORWARD --in-interface virbr0 --jump REJECT: iptables: 
No chain/target/match by that name.

  In linux 3.17 all is working good.

  Kubuntu 14.10 x86_64
  Libvirt0: 1.2.9-0~14.10~ppa0
  Virt-manager: 1:1.1.0-0~14.10~ppa0

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