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[Launchpad Bug Tracker <1481295@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package netcf - 1:0.2.6-1ubuntu2

---------------
netcf (1:0.2.6-1ubuntu2) wily; urgency=medium

  * Cherrypick upstream patch to avoid erroring out on aliases which have
    no /sys/class/net/ directory.  (LP: #1481295)

 -- Serge Hallyn <serge.hallyn@xxxxxxxxxx>  Fri, 30 Oct 2015 14:17:29
-0500

** Changed in: netcf (Ubuntu Wily)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1481295

Title:
  virt-manager after upgrade: Error polling connection 'qemu:///system':
  internal error: could not get interface XML description: File
  operation failed - Failed to read (null)

Status in netcf package in Ubuntu:
  Fix Released
Status in virt-manager package in Ubuntu:
  Fix Released
Status in netcf source package in Vivid:
  Fix Committed
Status in virt-manager source package in Vivid:
  Confirmed
Status in netcf source package in Wily:
  Fix Released
Status in virt-manager source package in Wily:
  Triaged
Status in netcf source package in Xenial:
  Fix Released
Status in virt-manager source package in Xenial:
  Fix Released

Bug description:
  ==========================
  Impact: virt-manager fails to start
  Upstream fix: do not fail when /sys/class/net/$alias/ does not exist
  Development fix: cherrypick of the original patch.
  Regression potential: the patch did need some porting, so if that was not done right we could get a regression during netcf or libvirt
  Test case:
  	cat .> /etc/network/interfaces  << EOF
  iface eth0:1 inet static
    address 192.168.1.1
    netmask 255.255.255.0
  EOF
  	virsh iface-dumpxml eth0:1
   The virsh command should succeed and show something like
  <interface type='ethernet' name='eth0:1'>
  </interface>

  ==========================

  I upgraded my machine to vivid some weeks ago and never tested this VM
  I had working before.

  When I try to use the virt-manager, it shows an error:
  Error polling connection 'qemu:///system': internal error: could not get interface XML description: File operation failed - Failed to read (null)

  Ubuntu 15.04

  virt-manager:
    Installed: 1:1.0.1-5ubuntu1
    Candidate: 1:1.0.1-5ubuntu1
    Version table:
   *** 1:1.0.1-5ubuntu1 0
          500 http://gb.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
          100 /var/lib/dpkg/status

  Expected: to keep working as before
  Instead: can't list and run installed  VMs

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: virt-manager 1:1.0.1-5ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2
  Uname: Linux 3.19.0-25-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Tue Aug  4 11:39:39 2015
  InstallationDate: Installed on 2014-09-07 (330 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  PackageArchitecture: all
  SourcePackage: virt-manager
  UpgradeStatus: Upgraded to vivid on 2015-07-13 (22 days ago)

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