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Antoine Pitrou authored and Krisztián Szűcs committed 1b8a7bc3baa
ARROW-4281: [CI] Use Ubuntu Xenial VMs on Travis-CI The R build job still uses Trusty, though, as the community-supported R images don't work with Xenial. Author: Antoine Pitrou <antoine@python.org> Closes #3418 from pitrou/ARROW-4281-travis-ci-xenial and squashes the following commits: 7cdc8136 <Antoine Pitrou> Remove superfluous conda-forge references 3b9fb1b8 <Antoine Pitrou> ARROW-4281: Use Ubuntu Xenial VMs on Travis-CI