title: sudo apt-get update not working
body: <p>I have been using ubuntu 13.04 in oracle virtualbox. The command <code>sudo apt-get update</code> is not working for me and is giving lot of 404 errors.I got stucked.</p>
  
  <p>Here are my sources.list file entries</p>
  
  <pre><code>###### Ubuntu Main Repos
  deb http://in.archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse 
  deb-src http://in.archive.ubuntu.com/ubuntu/ raring main restricted universe multiverse 
  
  ###### Ubuntu Update Repos
  deb http://in.archive.ubuntu.com/ubuntu/ raring-security main restricted universe multiverse 
  deb http://in.archive.ubuntu.com/ubuntu/ raring-updates main restricted universe multiverse 
  deb http://in.archive.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse 
  deb http://in.archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse 
  deb-src http://in.archive.ubuntu.com/ubuntu/ raring-security main restricted universe multiverse 
  deb-src http://in.archive.ubuntu.com/ubuntu/ raring-updates main restricted universe multiverse 
  deb-src http://in.archive.ubuntu.com/ubuntu/ raring-proposed main restricted universe multiverse 
  deb-src http://in.archive.ubuntu.com/ubuntu/ raring-backports main restricted universe multiverse
  </code></pre>