Give up on Swift on Ubuntu 16.04. The risk of breaking the Bazel postsubmit is too high.
@@ -126,15 +126,3 @@ RUN curl -sL https://deb.nodesource.com/setup_12.x | bash - && \
### Install Go.
ENV GO_HOME "/opt/go1.13.8.linux-amd64"
ENV PATH "${PATH}:${GO_HOME}/bin"
-
-### Install Swift toolchain (required by rules_swift).
-ENV SWIFT_HOME "/opt/swift-5.2.5-RELEASE-ubuntu16.04"
-ENV PATH "${PATH}:${SWIFT_HOME}/usr/bin"
-
-### Fix missing symlink.
-# This is missing in Ubuntu 16.04 and was added in later versions.
-# Because recent Swift versions also ship the llvm-profdata binary, Bazel's test
-# //src/test/shell/bazel:bazel_coverage_cc_head_test_llvm will accidentally pick
-# that one, which isn't compatible with the rest of the system-provided clang,
-# causing the test to fail. Installing this symlink fixes the issue.
-RUN ln -s /usr/lib/llvm-3.8/bin/llvm-profdata /usr/bin/llvm-profdata
