Comment 11 for bug 1630906

Otherwise "ok" so far regarding rebuilds but unmodified UITK starts to fail two subtests on arm64: bug #1631941. Those did pass before the builder kernel update, and it's now not sure where those new failures come from. But they do happen on both xenial and yakkety: https://launchpad.net/~ci-train-ppa-service/+archive/ubuntu/2055/+packages