Downloading/unpacking pylint
  Downloading pylint-2.1.1-py3-none-any.whl (737kB): 737kB downloaded
Downloading/unpacking isort>=4.2.5 (from pylint)
  Downloading isort-4.3.4-py3-none-any.whl (45kB): 45kB downloaded
Downloading/unpacking astroid>=2.0.0 (from pylint)
  Downloading astroid-2.0.4-py3-none-any.whl (172kB): 172kB downloaded
Cleaning up...
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2482, in _dep_map
    return self.__dep_map
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2344, in __getattr__
    raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 122, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 278, in run
    requirement_set.prepare_files(finder, force_root_egg_info=self.bundle, bundle=self.bundle)
  File "/usr/lib/python3/dist-packages/pip/req.py", line 1266, in prepare_files
    req_to_install.extras):
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2291, in requires
    dm = self._dep_map
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2484, in _dep_map
    self.__dep_map = self._compute_dependencies()
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2517, in _compute_dependencies
    common = frozenset(reqs_for_extra(None))
  File "/usr/lib/python3/dist-packages/pkg_resources.py", line 2514, in reqs_for_extra
    if req.marker_fn(override={'extra':extra}):
  File "/usr/share/python-wheels/setuptools-3.3-py2.py3-none-any.whl/_markerlib/markers.py", line 113, in marker_fn
    return eval(compiled_marker, environment)
  File "<environment marker>", line 1, in <module>
NameError: name 'implementation_name' is not defined

Storing debug log for failure in /home/ubuntu/.pip/pip.log