Obfsproxy error

Ubuntu 17.04
============

sudo apt install obfsproxy

sudo obfsproxy -v

Traceback (most recent call last):
  File "/usr/bin/obfsproxy", line 6, in <module>
    from pkg_resources import load_entry_point
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py",
line 3019, in <module>
    @_call_aside
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py",
line 3003, in _call_aside
    f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py",
line 3032, in _initialize_master_working_set
    working_set = WorkingSet._build_master()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py",
line 646, in _build_master
    ws = cls()
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py",
line 639, in __init__
    self.add_entry(entry)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py",
line 695, in add_entry
    for dist in find_distributions(entry, True):
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py",
line 2012, in find_on_path
    if len(os.listdir(fullpath)) == 0:
OSError: [Errno 13] Permission denied:
'/usr/local/lib/python2.7/dist-packages/zope.interface-4.4.2.dist-info'