title: Error while installing cassandra
body: <p>I am trying to install apache cassandra on ubuntu 16.04 LTS following instructions here -> <a href="http://docs.datastax.com/en/cassandra/3.x/cassandra/install/installDeb.html" rel="noreferrer">http://docs.datastax.com/en/cassandra/3.x/cassandra/install/installDeb.html</a>.</p>
  
  <p>However I am getting the following error while running <strong><em>sudo apt-get install datastax-ddc</em></strong> command:</p>
  
  <pre><code>Reading package lists... Done Building dependency tree  
  Reading state information... Done Some packages could not be
  installed. This may mean that you have requested an impossible
  situation or if you are using the unstable distribution that
  some required packages have not yet been created or been moved
  out of Incoming. The following information may help to resolve
  the situation:
  
  The following packages have unmet dependencies:
    datastax-ddc :  Depends: python-support (&gt;= 0.90.0) but it is not
                             installable  
                    Recommends: ntp but it is not going to be installed or  
                                time-daemon
                    Recommends: datastax-ddc-tools but it is not going to
                                be installed  E: Unable to correct problems,
                                you have held broken packages.
  </code></pre>
  
  <p>Is the datastax-ddc broken or something is wrong with my python?</p>