Ceph

I reboot a new OSD VM after creating and activating the OSD using ceph-deploy. I get the following backtrace after noticing that the OSD did not start.

Command used:sudo /etc/init.d/ceph start

Traceback (most recent call last):
  File "/usr/bin/ceph-detect-init", line 5, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3074, in <module>
    @_call_aside
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3060, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 3087, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 645, in _build_master
    ws.require(__requires__)
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 946, in require
    needed = self.resolve(parse_requirements(requirements))
  File "/usr/lib/python2.7/site-packages/pkg_resources/__init__.py", line 833, in resolve
    raise DistributionNotFound(req, requirers)
pkg_resources.DistributionNotFound: The 'argparse' distribution was not found and is required by ceph-detect-init
ERROR:ceph-disk:Failed to activate
ceph-disk: Command '/usr/bin/ceph-detect-init' returned non-zero exit status 1
ceph-disk: Error: One or more partitions failed to activate