From @Findus23 changing the travis yml to https://github.com/matomo-org/matomo/compare/ui-tests-bionic seems to fix the UI tests by getting it to use bionic. Note that this change fails other tests see https://app.travis-ci.com/github/matomo-org/matomo/jobs/540837360#L414 meaning we likely need to also adjust the travis template in https://github.com/matomo-org/travis-scripts/blob/master/generator/TravisYmlView.php#L258 or make it work some other way.
Instead of removing the
dist entry we would change it to
We probably also need to create some documentation around this part of travis in https://developer.matomo.org/guides/tests-travis-extended if that's not done yet.
I'm not 100% sure about best way to solve this. However, I think for the UI test group we can simply change the
bionic without needing any change in