title: Please check that the PPA name or format is correct
body: <p>In my Ubuntu 14.04 I'm trying to install the Captiva icon pack as listed on <a href="http://www.omgubuntu.co.uk/2014/09/4-gorgeous-linux-icon-themes-download" rel="nofollow">this omgubuntu post</a>. So I copy pasted the following command in the terminal:</p>
  
  <pre><code>sudo add-apt-repository ppa:captiva/ppa
  </code></pre>
  
  <p>but I get the following result:</p>
  
  <pre><code>Cannot add PPA: 'ppa:captiva/ppa'.
  Please check that the PPA name or format is correct. 
  </code></pre>
  
  <p>Am I doing something wrong here? Any help is appreciated.</p>