Public bug reported:

I have updated from Quantal to Raring. Under Quantal I have set up
several virtual machines using the Virtual Machine Manager and qemu/kvm.
While under Quantal the machines always worked perfectly. After the
update to Raring I cannot boot them any more. When I click the geen Play
button to boot the selected machine I get a pop-up error message:

"Error starting domain: Unable to read from monitor: Connection reset by
peer"

Clicking on "Details" gives me a Python traceback:

----------
Error starting domain: Unable to read from monitor: Connection reset by peer

Traceback (most recent call last):
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 96, in cb_wrapper
    callback(asyncjob, *args, **kwargs)
  File "/usr/share/virt-manager/virtManager/asyncjob.py", line 117, in tmpcb
    callback(*args, **kwargs)
  File "/usr/share/virt-manager/virtManager/domain.py", line 1092, in startup
    self._backend.create()
  File "/usr/lib/python2.7/dist-packages/libvirt.py", line 681, in create
    if ret == -1: raise libvirtError ('virDomainCreate() failed', dom=self)
libvirtError: Unable to read from monitor: Connection reset by peer
----------

Attached is my file ~/.virt-manager/virt-manager.log

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: qemu (not installed)
ProcVersionSignature: Ubuntu 3.8.0-13.22-generic 3.8.3
Uname: Linux 3.8.0-13-generic x86_64
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
Date: Tue Mar 19 10:01:00 2013
InstallationDate: Installed on 2012-07-27 (235 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120724.2)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: qemu
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: qemu (Ubuntu)
     Importance: High
         Status: New


** Tags: amd64 apport-bug raring regression-release

** Attachment added: "~/.virt-manager/virt-manager.log"
   
https://bugs.launchpad.net/bugs/1157066/+attachment/3582766/+files/virt-manager.log

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https://bugs.launchpad.net/bugs/1157066

Title:
  REGRESSION: VMs do not boot out of Virtual Machine Manager any more

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