"Disallowing sources: ubuntu-toolchain-r-test" started to appear recently

I’m using the Linux xenial image for a while now with ubuntu-toolchain-r-test as a source to install various GCCs. However recently (today?, maybe yesterday) this fails with “Disallowing sources: ubuntu-toolchain-r-test”

The repo is listed in https://github.com/travis-ci/apt-source-safelist/blob/0c2267bff66def573d31a8240ff7d31795e1f6fa/ubuntu.json#L557 since like forever so why does this fail?

Related: https://github.com/travis-ci/apt-source-safelist/issues/410 and Disallowing sources: ppa:ubuntu-toolchain-r/test on bionic for the same issue on bionic. And https://github.com/travis-ci/apt-source-safelist/issues/383 for the old issue about xenial.

Seems to be a more general problem: Don’t the images share the whitelist?

We are seeing this issue too. The quick fix described in this comment seems to be working.

Can someone point to a recent failure?

It’s working as of 2020-04-03T16:48-0400.

https://travis-ci.org/github/BanzaiMan/travis_production_test/builds/670748589#L170

Seems to only be affecting our travis-ci.com builds and not our public travis-ci.org ones. (So no, unfortunately, unable to point to a recent failure because they are all private.)

@BanzaiMan I got some from https://travis-ci.com/github/boostorg/nowide/pull_requests

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