title: shell:install gawk on ubuntu 12.04
body: <p>i try to install gawk on Ubuntu 12.04 but it give an error</p>
  
  <p>when i enter </p>
  
  <pre><code>sudo apt-get install gawk
  </code></pre>
  
  <p>it give me the following error.</p>
  
  <pre><code>E:unable to locate packet gawk.
  </code></pre>