nova crashs with "Versioning for this project requires either an sdist tarball,"

[Clay Claiborne]

I have this issue in attempting to install nova on ubuntu 14.04 I've run pip install -U successfully on all these packages: pyrax, pbr, rackspace-novaclient, python-novaclient, rackspace-auth-openstack, os-diskconfig-python-novaclient-ext, rax-scheduled-images-python-novaclient-ext, os-networksv2-python-novaclient-ext, os-virtual-interfacesv2-python-novaclient-ext, rax-default-network-flags-python-novaclient-ext

Still no joy, an attempt to run nova returns:

root@clay-rsnote:~# nova
Traceback (most recent call last):
  File "/usr/local/bin/nova", line 6, in <module>
    from novaclient.shell import main
  File "/usr/local/lib/python2.7/dist-packages/novaclient/shell.py", line 32, in <module>
    from keystoneclient import session as ksession
  File "/usr/local/lib/python2.7/dist-packages/keystoneclient/__init__.py", line 37, in <module>
    __version__ = pbr.version.VersionInfo('python-keystoneclient').version_string()
  File "/usr/local/lib/python2.7/dist-packages/pbr/version.py", line 78, in version_string
    for part in self.release_string().split('.'):
  File "/usr/local/lib/python2.7/dist-packages/pbr/version.py", line 70, in release_string
    self.release = self._get_version_from_pkg_resources()
  File "/usr/local/lib/python2.7/dist-packages/pbr/version.py", line 62, in _get_version_from_pkg_resources
    return packaging.get_version(self.package)
  File "/usr/local/lib/python2.7/dist-packages/pbr/packaging.py", line 870, in get_version
    raise Exception("Versioning for this project requires either an sdist"
Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository. Are you sure that git is installed

I 've also tried uninstalling and re-installing python-keystoneclient as suggested on https://github.com/rackspace/pyrax/issues/450, however I still have the same problem:

Successfully installed python-keystoneclient
Cleaning up...
root@clay-rsnote:~# nova
Traceback (most recent call last):
File "/usr/local/bin/nova", line 6, in
from novaclient.shell import main
File "/usr/local/lib/python2.7/dist-packages/novaclient/shell.py", line 32, in
from keystoneclient import session as ksession
File "/usr/local/lib/python2.7/dist-packages/keystoneclient/init.py", line 37, in
version = pbr.version.VersionInfo('python-keystoneclient').version_string()
File "/usr/local/lib/python2.7/dist-packages/pbr/version.py", line 78, in version_string
for part in self.release_string().split('.'):
File "/usr/local/lib/python2.7/dist-packages/pbr/version.py", line 70, in release_string
self.release = self._get_version_from_pkg_resources()
File "/usr/local/lib/python2.7/dist-packages/pbr/version.py", line 62, in _get_version_from_pkg_resources
return packaging.get_version(self.package)
File "/usr/local/lib/python2.7/dist-packages/pbr/packaging.py", line 870, in get_version
raise Exception("Versioning for this project requires either an sdist"
Exception: Versioning for this project requires either an sdist tarball, or access to an upstream git repository. Are you sure that git is installed?