diff --git a/dockerfiles/ubuntu-16.04.sources.list b/dockerfiles/ubuntu-16.04.sources.list
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index 0000000000000000000000000000000000000000..0e7283d3053ca70eff1cc1c191000c2e840cc6c3
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+++ b/dockerfiles/ubuntu-16.04.sources.list
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+# http://layer0.authentise.com/docker-4-useful-tips-you-may-not-know-about.html
+deb mirror://mirrors.ubuntu.com/mirrors.txt xenial main restricted universe multiverse
+deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-updates main restricted universe multiverse
+deb mirror://mirrors.ubuntu.com/mirrors.txt xenial-security main restricted universe multiverse