RuntimeError: Failed to import pydot. You must install pydot and graphviz for `pydotprint` to work.

Using TensorFlow backend. Traceback (most recent call last): File "mnist-cnn.py", line 14, in <module> from keras.utils.visualize_util import plot File "/usr/local/lib/python2.7/dist-packages/keras/utils/visualize_util.py", line 13, in <module> raise RuntimeError('Failed to import pydot. You must install pydot' <b>RuntimeError: Failed to import pydot. You must install pydot and graphviz for pydotprint to work.</b>

When the above error occurs

sudo apt-get install graphviz pip install graphviz pip install pydot==1.1.0 Was done.

on Ubuntu 16.04.