Comment 8 for bug 838581

Hi,
  I've just uploaded a ppa build of nova to https://launchpad.net/~smoser/+archive/ppa with a patch pulled back from trunk which is reported to fix this issue.
  Could someone listening here please try to with my ppa build and report back if that fixes your problem.

  To do this, simply run the following on your openstack systems.
  sudo apt-add-repository ppa:smoser/ppa
  sudo apt-get update
  sudo apt-get install nova

Then do whatever you did that would previously cause the failure.

Thanks.