R2.01 to R2.20 upgrade: none of the fabric commands work after upgrade

R2.01 to R2.20(build 18) ubuntu 14.04/Juno upgrade :

After installing the contrail-install-packages and running setup.sh none of he fab commands worked.

root@a5s194:/opt/contrail/utils# dpkg -l | grep contrail-install
ii contrail-install-packages 2.20-18~juno all Contrail Installer Packages - Container of debian packages

root@a5s194:/opt/contrail/utils# dpkg -l | grep contrail-setup
ii contrail-setup 2.20-18 all Contrail Setup package with scripts for provisioning

root@a5s194:/opt/contrail/utils# dpkg -l | grep fabric
ii contrail-fabric-utils 2.20-18 all Contrail Fabric Utilities for cluster management

root@a5s194:/opt/contrail/utils# fab -V
Traceback (most recent call last):
  File "/usr/local/bin/fab", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 2749, in <module>
    working_set = WorkingSet._build_master()
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 446, in _build_master
    return cls._build_from_requirements(__requires__)
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 459, in _build_from_requirements
    dists = ws.resolve(reqs, Environment())
  File "/usr/lib/python2.7/dist-packages/pkg_resources.py", line 628, in resolve
    raise DistributionNotFound(req)
pkg_resources.DistributionNotFound: ecdsa>=0.11

root@a5s194:/opt/contrail/utils# dpkg -l | grep ecdsa
ii python-ecdsa 0.10-2 all ECDSA cryptographic signature library (Python 2)