Travis CI: Cypress failed to start

[DuncanBetts]

Comments welcome, but I intend to work on this myself.

Full Travis CI Console Output

Excerpt:

$ npm run cypress:run
> nexchange-open-client-react@0.1.0 cypress:run /home/travis/build/onitsoft/nexchange-open-client-react
> cypress run
It looks like this is your first time using Cypress: 2.1.0
[14:21:15]  Verifying Cypress can run /home/travis/build/onitsoft/nexchange-open-client-react/node_modules/cypress/dist/Cypress [started]
[14:21:16]  Verifying Cypress can run /home/travis/build/onitsoft/nexchange-open-client-react/node_modules/cypress/dist/Cypress [failed]
Cypress failed to start.
This is usually caused by a missing library or dependency.
The error below should indicate which dependency is missing.
https://on.cypress.io/required-dependencies
If you are using Docker, we provide containers with all required dependencies installed.
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/home/travis/build/onitsoft/nexchange-open-client-react/node_modules/cypress/dist/Cypress/Cypress: error while loading shared libraries: libgconf-2.so.4: cannot open shared object file: No such file or directory
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Platform: linux (Ubuntu Linux - 16.04)
Cypress Version: 2.1.0