Error installing 'oraclejdk8': "Expected feature release number in range of 9 to 14, but got: 8"

I’m not sure Marten! This is all very confusing. How could Travis break my Java 8 builds without providing some kind of notice or additional information?

It looks like my last successful build (0) was using ‘Build dist: trusty’, and the failing build (1) is using ‘Build dist: xenial’.