Pip install rasa_nlu[tensorflow] - Segmentation fault

I am setting up the RASA stack for the first time on Ubuntu 18.04.2 with python 3.6.7. When I run:
pip install rasa_nlu[tensorflow]
I get a segmentation fault.

Any idea what might be wrong? Could I be missing a dependency?

Here’s a copy of the screen:

pip install rasa_nlu[tensorflow]
Collecting rasa_nlu[tensorflow]
Collecting typing~=3.6 (from rasa_nlu[tensorflow])
  Using cached https://files.pythonhosted.org/packages/cc/3e/29f92b7aeda5b078c86d14f550bf85cff809042e3429ace7af6193c3bc9f/typing-3.6.6-py2-none-any.whl
Collecting packaging~=18.0 (from rasa_nlu[tensorflow])
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Collecting jsonschema~=2.6 (from rasa_nlu[tensorflow])
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Collecting coloredlogs~=10.0 (from rasa_nlu[tensorflow])
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Collecting cloudpickle~=0.6.1 (from rasa_nlu[tensorflow])
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Collecting klein~=17.10 (from rasa_nlu[tensorflow])
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Collecting numpy>=1.16 (from rasa_nlu[tensorflow])
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Collecting boto3~=1.9 (from rasa_nlu[tensorflow])
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Collecting tensorflow~=1.13.0; extra == "tensorflow" (from rasa_nlu[tensorflow])
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Collecting sklearn-crfsuite~=0.3.6; extra == "tensorflow" (from rasa_nlu[tensorflow])
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Collecting pyparsing>=2.0.2 (from packaging~=18.0->rasa_nlu[tensorflow])
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Collecting functools32; python_version == "2.7" (from jsonschema~=2.6->rasa_nlu[tensorflow])
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Collecting incremental (from klein~=17.10->rasa_nlu[tensorflow])
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Collecting urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1 (from requests~=2.20->rasa_nlu[tensorflow])
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Collecting backports.functools-lru-cache (from matplotlib~=2.2->rasa_nlu[tensorflow])
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Collecting kiwisolver>=1.0.1 (from matplotlib~=2.2->rasa_nlu[tensorflow])
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Collecting python-dateutil>=2.1 (from matplotlib~=2.2->rasa_nlu[tensorflow])
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Collecting greenlet>=0.4.14; platform_python_implementation == "CPython" (from gevent~=1.3->rasa_nlu[tensorflow])
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Collecting ruamel.ordereddict; platform_python_implementation == "CPython" and python_version <= "2.7" (from ruamel.yaml~=0.15.7->rasa_nlu[tensorflow])
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Collecting jmespath<1.0.0,>=0.7.1 (from boto3~=1.9->rasa_nlu[tensorflow])
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Collecting s3transfer<0.3.0,>=0.2.0 (from boto3~=1.9->rasa_nlu[tensorflow])
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Installing collected packages: typing, pyparsing, six, packaging, functools32, jsonschema, monotonic, humanfriendly, coloredlogs, tqdm, cloudpickle, incremental, setuptools, PyHamcrest, zope.interface, idna, hyperlink, attrs, Automat, constantly, Twisted, werkzeug, klein, urllib3, certifi, chardet, requests, simplejson, cycler, numpy, backports.functools-lru-cache, subprocess32, kiwisolver, pytz, python-dateutil, matplotlib, greenlet, gevent, future, ruamel.ordereddict, ruamel.yaml, scipy, scikit-learn, jmespath, docutils, botocore, futures, s3transfer, boto3, funcsigs, mock, enum34, absl-py, tensorflow-estimator, grpcio, h5py, keras-applications, protobuf, keras-preprocessing, gast, wheel, markdown, tensorboard, backports.weakref, termcolor, astor, tensorflow, python-crfsuite, tabulate, sklearn-crfsuite, rasa-nlu
Segmentation fault (core dumped)