First, you are downloading chrome: beta in the failing job. (https://travis-ci.com/infor-design/enterprise/jobs/233764514/config)
Second, https://travis-ci.com/infor-design/enterprise/jobs/233764514#L424 (I actually found it by searching the raw log for “chrome”):
dpkg-deb: error: archive ‘/tmp/google-chrome-beta_current_amd64.deb’ has premature member ‘control.tar.xz’ before ‘control.tar.gz’, giving up
Means that dpkg cannot understand the package’s format.
Since xz is a newer format than gz, this most likely means that dpkg is too old.
I.e. that Google has dropped Trusty support in its Chrome .deb packages, and you need to migrate to Xenial or Bionic.
The Chrome version that you see further on is presumably a preinstalled one.