Upgrade 0.67 failed with

Opened an issue:https://github.com/home-assistant/home-assistant/issues/13898

My updrade failed with an error:

Collecting homeassistant
  Downloading homeassistant-0.67.0-py2.py3-none-any.whl (2.5MB)
    100% |████████████████████████████████| 2.5MB 116kB/s
Collecting pip>=8.0.3 (from homeassistant)
  Downloading pip-10.0.0-py2.py3-none-any.whl (1.3MB)
    100% |████████████████████████████████| 1.3MB 203kB/s
Requirement already up-to-date: astral==1.6 in /srv/homeassistant/lib/python3.6/site-packages (from homeassistant)
Requirement already up-to-date: certifi>=2017.4.17 in /srv/homeassistant/lib/python3.6/site-packages (from homeassistant)
Collecting pytz>=2017.02 (from homeassistant)
  Downloading pytz-2018.4-py2.py3-none-any.whl (510kB)
    100% |████████████████████████████████| 512kB 472kB/s
Requirement already up-to-date: requests==2.18.4 in /srv/homeassistant/lib/python3.6/site-packages (from homeassistant)
Requirement already up-to-date: jinja2>=2.10 in /srv/homeassistant/lib/python3.6/site-packages (from homeassistant)
Collecting aiohttp==3.1.1 (from homeassistant)
  Downloading aiohttp-3.1.1.tar.gz (751kB)
    100% |████████████████████████████████| 757kB 319kB/s
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2760, in get_entry_map
        ep_map = self._ep_map
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2731, in __getattr__
        raise AttributeError(attr)
    AttributeError: _ep_map

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/tmp/pip-build-f8axn14y/aiohttp/setup.py", line 132, in <module>
        setup(**args)
      File "/srv/homeassistant/lib/python3.6/site-packages/setuptools/__init__.py", line 128, in setup
        _install_setup_requires(attrs)
      File "/srv/homeassistant/lib/python3.6/site-packages/setuptools/__init__.py", line 117, in _install_setup_requires
        (k, v) for k, v in attrs.items()
      File "/srv/homeassistant/lib/python3.6/site-packages/setuptools/dist.py", line 331, in __init__
        for ep in pkg_resources.iter_entry_points('distutils.setup_keywords'):
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 737, in iter_entry_points
        entries = dist.get_entry_map(group)
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2763, in get_entry_map
        self._get_metadata('entry_points.txt'), self
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2492, in parse_map
        for group, lines in data:
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 3095, in split_sections
        for line in yield_lines(s):
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2352, in yield_lines
        for ss in strs:
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2689, in _get_metadata
        for line in self.get_metadata_lines(name):
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1497, in get_metadata_lines
        return yield_lines(self.get_metadata(name))
      File "/srv/homeassistant/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1494, in get_metadata
        return value.decode('utf-8') if six.PY3 else value
    UnicodeDecodeError: 'utf-8' codec can't decode byte 0xba in position 50: invalid start byte

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-f8axn14y/aiohttp/
You are using pip version 9.0.3, however version 10.0.0 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

Does anyone has an idea?

Seems very similar to this

The solution was to re-install the virtual environment.