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[Serge Hallyn <1387140@xxxxxxxxxxxxxxxxxx>]

If you are able to reproduce this with libvirt from the archive, please
re-open this bug.

** Changed in: libvirt (Ubuntu)
       Status: Confirmed => Invalid

** Changed in: linux (Ubuntu)
       Status: Confirmed => Invalid

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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:
  Invalid
Status in linux package in Ubuntu:
  Invalid

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
  --- 
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: amd64
  CurrentDesktop: KDE
  DistroRelease: Ubuntu 14.10
  InstallationDate: Installed on 2014-06-08 (143 days ago)
  InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140416.1)
  Package: linux (not installed)
  ProcCmdline: BOOT_IMAGE=/@/boot/vmlinuz-3.18.0-031800rc2-generic root=UUID=b76fc0ae-d31c-4b13-8f4e-424542d850c9 ro rootflags=subvol=@ quiet splash vt.handoff=7
  ProcVersionSignature: Error: [Errno 2] Немає такого файла або каталогу: '/proc/version_signature'
  Tags:  utopic utopic
  Uname: Linux 3.18.0-031800rc2-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: Upgraded to utopic on 2014-10-24 (5 days ago)
  UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  modified.conffile..etc.libvirt.qemu.conf: [inaccessible: [Errno 13] Відмовлено у доступі: u'/etc/libvirt/qemu.conf']

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