Specify ubuntu 16.04 for Travis CI and modify a dependency accordingly

chainer / chainerrl

ChainerRL is a deep reinforcement learning library built on top of Chainer.

MIT License

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Closed muupan closed 5 years ago

muupan commented 5 years ago

Resolves #519.

Specify ubuntu 16.04 (xenial) as a distribution to use in Travis CI. See #519 for the reason.
Use xvfb service since the previous way does not work with 16.04.
Install fleeglut3-dev to avoid ImportError: Library "GLU" not found.