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investigate why mirror.gcr.io/library/ubuntu:18.04 is not working
Now we're using our own cache, but using the mirror is better in a long run.
It turned out that we should never pull directly from mirror.gcr.io. It's a cache. We should use mirror.gcr.io as a parameter for --registry-mirrors
setting on Docker daemon.
I think we should make a change in our Kokoro ubuntu image.
I asked Kokoro team about this.