No module named _multiarray_umath - but I can find it

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Having issue with importing a NUMPY module. Have been fighting for hours with it. I have only minor experience with Python.

Summary eror is this:

Original error was: No module named _multiarray_umath

Full error is below.

I am using ROS Lunar on a fresh install of 64bit Ubuntu 16.04. Python 2.7 and 3.5 are installed.

There is a file called _multiarray_umath.cpython-35m-x86_64-linux-gnu.so in the .local/lib/python3.5/site-packages/numpy/core folder.

My PYTHONPATH includes /home/b2/.local/lib/python3.5/site-packages

Full PYTHONPATH

PYTHONPATH = :/home/b2/catkin_ws/devel/lib/python2.7/dist-packages:/opt/ros/lunar/lib/python2.7/dist-packages::/home/b2/tf/models/research/object_detection:/home/b2/tf/models/research/object_detection/slim:/home/b2/tf/models:/home/b2/tf/models/slim:/home/b2/tf/models:/home/b2/tf/models/slim:/home/b2/tf/models:/home/b2/tf/models/research:/home/b2/tf/models:/home/b2/tf/models/research/object_detection:/home/b2/dodo:/home/b2/.local/lib/python3.5/site-packages

Full error:

process[dodo_detector_ros-1]: started with pid [32515]
Traceback (most recent call last):
  File "/home/b2/catkin_ws/src/dodo_detector_ros/src/detector.py", line 5, in <module>
    import numpy
  File "/home/b2/.local/lib/python3.5/site-packages/numpy/__init__.py", line 142, in <module>
    from . import core
  File "/home/b2/.local/lib/python3.5/site-packages/numpy/core/__init__.py", line 47, in <module>
    raise ImportError(msg)
ImportError: 

IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!

Importing the numpy c-extensions failed.
- Try uninstalling and reinstalling numpy.
- If you have already done that, then:
  1. Check that you expected to use Python2.7 from "/usr/bin/python",
     and that you have no directories in your PATH or PYTHONPATH that can
     interfere with the Python and numpy version "1.17.0" you're trying to use.
  2. If (1) looks fine, you can open a new issue at
     https://github.com/numpy/numpy/issues.  Please include details on:
     - how you installed Python
     - how you installed numpy
     - your operating system
     - whether or not you have multiple versions of Python installed
     - if you built from source, your compiler versions and ideally a build log

- If you're working with a numpy git repository, try `git clean -xdf`
  (removes all files not under version control) and rebuild numpy.

Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.

Original error was: No module named _multiarray_umath

[dodo_detector_ros-1] process has died [pid 32515, exit code 1, cmd /home/b2/catkin_ws/src/dodo_detector_ros/src/detector.py __name:=dodo_detector_ros __log:=/home/b2/.ros/log/83d1cde4-bc00-11e9-8dfc-100ba9588b18/dodo_detector_ros-1.log].
log file: /home/b2/.ros/log/83d1cde4-bc00-11e9-8dfc-100ba9588b18/dodo_detector_ros-1*.log
all processes on machine have died, roslaunch will exit
shutting down processing monitor...
... shutting down processing monitor complete
done

I have unistalled and reinstalled numpy using pip3.

Attempting to install using just pip(pip install --upgrade numpy) results in an error saying python 3.5 required.

The user/bin/python folder has links to ... (more)