It looks like only Trusty is affected:
-
dist: trusty: https://travis-ci.org/cotsog/travis_ci_prod_regular/builds/525229081 -
dist: xenial: https://travis-ci.org/cotsog/travis_ci_prod_regular/builds/525229251
Is it an option for you to add dist: xenial to your config? Probably a good move given Trusty will be EOL at the end of the month.
Let me know what you think!