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at e.g. https://app.travis-ci.com/github/scala/scala/jobs/607977062 we're seeing
one way to fix it might be to add
Acquire::Check-Valid-Until false;
to/etc/apt/apt.conf
, as per https://askubuntu.com/questions/74345/how-do-i-bypass-ignore-the-gpg-signature-checks-of-aptbut maybe we could try first to get on a newer Ubuntu, since Travis-CI presumably won't support bionic indefinitely
the 2.12 and 2.13 spec builds are a bit different, so I might need to do experiments on both branches
we have been frozen on bionic because of a libssl version issue with wkhtmltopdf, so this might get painful
another possibility might be to move the spec build off Travis-CI and onto GitHub Actions.
previously: #10310, #10312
also scala/scala-dev#832 which has a brief remark about how the 2.12/2.13 divergence came about