DC/OS E2E's own tests run against the latest master versions of DC/OS OSS and DC/OS Enterprise.
https://api.travis-ci.org/v3/job/425098669/log.txt is a build log for tests/test_dcos_e2e/backends/docker/test_distributions.py::TestUbuntu1604::test_oss.
This tests that DC/OS OSS can start up on Ubuntu.
Four runs have happened in the last couple of hours - 2 x DC/OS OSS and 2 x DC/OS Enterprise.
Each of these has failed.
We should narrow this down and then decide what to do.
That might be - remove Ubuntu from DC/OS E2E.
Putting as a blocker at least for triage.