GNURADIO import error _iio_swig

Dear All,

I am following following guide to install GNURADIO with access to Pluto SDR on a Windows 10 Machine using Windows Subsystem for Linux. I followed the Preferred (Though recommended way is alternative pybombs installation gave me lot of issues) way and also added export python path ---- export PYTHONPATH=$PYTHONPATH:/usr/lib/python2.7/dist-packages/gnuradio

https://wiki.analog.com/resources/tools-software/linux-software/gnuradio

I get the following error

kashyap@kashyap-dell:~$ python
Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import iio
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/gnuradio/iio/__init__.py", line 35, in <module>
    from iio_swig import *
  File "/usr/lib/python2.7/dist-packages/gnuradio/iio/iio_swig.py", line 17, in <module>
    _iio_swig = swig_import_helper()
  File "/usr/lib/python2.7/dist-packages/gnuradio/iio/iio_swig.py", line 16, in swig_import_helper
    return importlib.import_module('_iio_swig')
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named _iio_swig
>>> from gnuradio import iio
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/dist-packages/gnuradio/iio/__init__.py", line 35, in <module>
    from iio_swig import *
  File "/usr/lib/python2.7/dist-packages/gnuradio/iio/iio_swig.py", line 17, in <module>
    _iio_swig = swig_import_helper()
  File "/usr/lib/python2.7/dist-packages/gnuradio/iio/iio_swig.py", line 16, in swig_import_helper
    return importlib.import_module('_iio_swig')
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
ImportError: No module named _iio_swig
>>>

Can any one help by telling me what am I missing here.