OpenCV not working properly with python on Linux with anaconda. Getting error that cv2.imshow() is not implemented : <p>This is the exact error that I am getting. My OS is Ubuntu 16.10.</p>

<p><strong>OpenCV Error: Unspecified error (The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script) in cvShowImage, file /feedstock_root/build_artefacts/work/opencv-3.1.0/modules/highgui/src/window.cpp, line 545
Traceback (most recent call last):
  File "untitled.py", line 7, in 
    cv2.imshow('image',img)
cv2.error: /feedstock_root/build_artefacts/work/opencv-3.1.0/modules/highgui/src/window.cpp:545: error: (-2) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Carbon support. If you are on Ubuntu or Debian, install libgtk2.0-dev and pkg-config, then re-run cmake or configure script in function cvShowImage</strong></p>

<p>my code is:</p>

<pre><code>import numpy as np
import cv2

# Load an color image in grayscale
img = cv2.imread('0002.png',0)

cv2.imshow('image',img)
cv2.waitKey(0)
cv2.destroyAllWindows()
</code></pre>

<p>0002.png is an image in the same directory as the program.
I first installed anaconda with python 3.5, then I installed opencv by using the command </p>

<pre><code>conda install -c conda-forge opencv
</code></pre>

<p>I installed libgtk2.0-dev just as the error said to but I still get the same error.
Any help would be much appreciated. I've been trying to solve this for several hours.</p>
