pi@raspberrypi:~ $ pip install io
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
  File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 21, in <module>
    from pip._vendor.requests.packages.urllib3.exceptions import DependencyWarning
  File "/usr/lib/python2.7/dist-packages/pip/_vendor/__init__.py", line 67, in <module>
    vendored("distro")
  File "/usr/lib/python2.7/dist-packages/pip/_vendor/__init__.py", line 36, in vendored
    __import__(modulename, globals(), locals(), level=0)
  File "/usr/share/python-wheels/distro-1.0.1-py2.py3-none-any.whl/distro.py", line 1051, in <module>
  File "/usr/share/python-wheels/distro-1.0.1-py2.py3-none-any.whl/distro.py", line 595, in __init__
  File "/usr/share/python-wheels/distro-1.0.1-py2.py3-none-any.whl/distro.py", line 934, in _get_lsb_release_info
subprocess.CalledProcessError: Command 'lsb_release -a' returned non-zero exit status 134