The network connectivity errors seem to be resolved as of, approximately, 10:25 UTC time. We continue monitoring the situation and we recommend restarting any affected builds and contact us at support@travis-ci.com if these are still failing because of download errors.
Posted Nov 30, 2017 - 11:03 UTC
Investigating
We’re currently investigating reports of network reachability issues that are causing some downloads to fail during build time. These reachability issues seem to be affecting downloads from Launchpad, Nodejs.org, Gradle or Jitpack. We will provide more updates as soon we get them. Thanks for your understanding.