title: Unable to locate package python-gnomedesktop: Installing PyViz in ns3
body: <p>I am following the commands <a href="http://www.nsnam.com/2014/08/installing-pyviz-in-ns3.html" rel="nofollow">here</a> to install PyViz.</p>
  
  <p>I get the error:</p>
  
  <pre><code>~$ sudo apt-get install python-gnome2-desktop
  Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  Package python-gnome2-desktop is not available, but is referred to by another package.
  This may mean that the package is missing, has been obsoleted, or
  is only available from another source
  However the following packages replace it:
    python-wnck:i386 python-rsvg:i386 python-gnomekeyring:i386 python-wnck python-rsvg python-gnomekeyring
  
  E: Package 'python-gnome2-desktop' has no installation candidate
  </code></pre>
  
  <p>I tried to search the solutions for the problem but all give the same error.</p>
  
  <p>I have Ubuntu 15.04.</p>