title: docker ubuntu /bin/sh: 1: locale-gen: not found
body: <p>I put the locale setting codes below into my dockerfile, </p>
  
  <pre><code>FROM node:4-onbuild
  
  # Set the locale
  RUN locale-gen en_US.UTF-8
  ENV LANG en_US.UTF-8
  ENV LANGUAGE en_US:en
  ENV LC_ALL en_US.UTF-8
  </code></pre>
  
  <p>but it gives me the error </p>
  
  <pre><code>/bin/sh: 1: locale-gen: not found
  The command '/bin/sh -c locale-gen en_US.UTF-8' returned a non-zero code: 127
  </code></pre>
  
  <p>any idea? </p>