diff --git a/ci/travis/ci.sh b/ci/travis/ci.sh
index ae9a1966a..51d38b62b 100755
--- a/ci/travis/ci.sh
+++ b/ci/travis/ci.sh
@@ -324,8 +324,12 @@ build_wheels() {
         docker run --rm -w /ray -v "${PWD}":/ray "${MOUNT_BAZEL_CACHE[@]}" \
         quay.io/pypa/manylinux2014_x86_64 /ray/python/build-wheel-manylinux2014.sh
       else
+        ls /ray-mount
         cp -R /ray /ray-mount # copy repo files to the shared mount dir
-        docker run --rm -w /ray -v /ray-mount:/ray "${MOUNT_BAZEL_CACHE[@]}" \
+        ls /ray-mount
+        docker run --rm -v /ray:/ray-mounted ubuntu:focal ls /
+        docker run --rm -v /ray:/ray-mounted ubuntu:focal ls /ray-mounted
+        docker run --rm -w /ray -v /ray:/ray "${MOUNT_BAZEL_CACHE[@]}" \
           quay.io/pypa/manylinux2014_x86_64 /ray/python/build-wheel-manylinux2014.sh
         cp -R /ray-mount /ray # copy new files back here
         find . | grep whl # testing