title: fail to install gcc-4.7-multilib-arm-linux-gnueabihf
body: <p>I'm trying to install <code>gcc-4.7-multilib-arm-linux-gnueabihf</code> at Ubuntu, but got the below error:</p>
  
  <pre><code>Reading package lists… Done Building dependency tree Reading state
  information… Done E: Unable to locate package
  gcc-4.7-multilib-arm-linux-gnueabihf E: Couldn’t find any package by
  glob ‘gcc-4.7-multilib-arm-linux-gnueabihf’ E: Couldn’t find any
  package by regex ‘gcc-4.7-multilib-arm-linux-gnueabihf’
  </code></pre>