[MRG] MAINT Fixes apt by removing the ubuntu-toolchain-r/test repo #13934
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Reference Issues/PRs
Fixes #13928
What does this implement/fix? Explain your changes.
This PR removes the
ubuntu-toolchain-r/test
from the apt repository. This PPA is not added by default on ubuntu 16.04 LTS. With this PR everything will be pulled from thehttp://archive.ubuntu.com/ubuntu
repo.