Travis-CI switched to
default Ubuntu 16.04
on April 23, 2019.
This change was long overdue, but at least didn’t take as long as their default switch to Ubuntu 14.04 from 12.04, which was almost scandalous in how long it took.
Travis-CI has many strengths, but one of its weaknesses is their out of date Ubuntu configurations.
We have been doing some tasks in AppVeyor alone for some time, since
Ubuntu 18.04 has been available on AppVeyor
image: ubuntu1804 since September 2018.
Also keep in mind that Travis-CI defaults to
Python 3.6 for
lang: python builds
since April 16, 2019.