vagrant@vagrant-ubuntu-trusty-64:/charms/trusty/galera-cluster$ sudo pip install pbr
Downloading/unpacking pbr
  Downloading pbr-1.8.1-py2.py3-none-any.whl (89kB): 89kB downloaded
Installing collected packages: pbr
Successfully installed pbr
Cleaning up...
vagrant@vagrant-ubuntu-trusty-64:/charms/trusty/galera-cluster$ time bundletester -F -l debug
Traceback (most recent call last):
  File "/usr/local/bin/bundletester", 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 632, in resolve
    raise VersionConflict(dist,req) # XXX put more info here
pkg_resources.VersionConflict: (six 1.5.2 (/usr/lib/python2.7/dist-packages), Requirement.parse('six>=1.7'))