File "/usr/local/lib/python3.5/dist-packages/keras/utils/vis_utils.py", line 17, in _check_pydot
    raise ImportError('Failed to import pydot. You must install pydot'
ImportError: Failed to import pydot. You must install pydot and graphviz for `pydotprint` to work.

deeplearning@deep-learning-virtual-machine:~$ pip install pydot
Collecting pydot
Collecting pyparsing>=2.1.4 (from pydot)
  Using cached pyparsing-2.2.0-py2.py3-none-any.whl
Installing collected packages: pyparsing, pydot
  Found existing installation: pyparsing 2.0.3
    Uninstalling pyparsing-2.0.3:
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3.5/shutil.py", line 538, in move
    os.rename(src, real_dst)
PermissionError: [Errno 13] Permission denied: '/usr/lib/python3/dist-packages/__pycache__/pyparsing.cpython-35.pyc' -> '/tmp/pip-45miiuxw-uninstall/usr/lib/python3/dist-packages/__pycache__/pyparsing.cpython-35.pyc'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/local/lib/python3.5/dist-packages/pip/commands/install.py", line 342, in run
    prefix=options.prefix_path,
  File "/usr/local/lib/python3.5/dist-packages/pip/req/req_set.py", line 778, in install
    requirement.uninstall(auto_confirm=True)
  File "/usr/local/lib/python3.5/dist-packages/pip/req/req_install.py", line 754, in uninstall
    paths_to_remove.remove(auto_confirm)
  File "/usr/local/lib/python3.5/dist-packages/pip/req/req_uninstall.py", line 115, in remove
    renames(path, new_path)
  File "/usr/local/lib/python3.5/dist-packages/pip/utils/__init__.py", line 267, in renames
    shutil.move(old, new)
  File "/usr/lib/python3.5/shutil.py", line 553, in move
    os.unlink(src)
PermissionError: [Errno 13] Permission denied: '/usr/lib/python3/dist-packages/__pycache__/pyparsing.cpython-35.pyc'

sudo apt install python-pydot python-pydot-ng graphviz # python-pydot-ng isn't in the 14.04 repos