scala-dist jobs failing

[lrytz]

https://app.travis-ci.com/github/scala/scala-dist/builds/276605912

sudo apt-get -qq update fails with

W: The repository 'https://apt.bell-sw.com stable Release' does not have a Release file.
E: Failed to fetch https://apt.bell-sw.com/dists/stable/main/binary-amd64/Packages  server certificate verification failed. CAfile: /etc/ssl/certs/ca-certificates.crt CRLfile: none
E: Some index files failed to download. They have been ignored, or old ones used instead.

Probably time to move from xenial to a more recent ubuntu release (https://docs.travis-ci.com/user/reference/linux)

[lrytz]

Seems fine, I re-ran one of the recently failed jobs https://app.travis-ci.com/github/scala/scala-dist/jobs/636043062