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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1387140

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

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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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