title: Ctrl + Space not working for content assist on eclipse
body: <p>My problem is that the content assist window won't pop up after clicking <code>Ctrl + Space</code>. I checked my shortcuts and the content assist is bound to <code>Ctrl + Space</code>. Sometimes the window automatically pops up making suggestion after typing dot e.g., but this won't happen when using the keys combination.</p>
  
  <p>Eclipse version:</p>
  
  <blockquote>
    <p>Eclipse Java EE IDE for Web Developers.</p>
    
    <p>Version: Kepler Service Release 1 Build id: 20130919-0819</p>
  </blockquote>
  
  <p>My OS is Ubuntu 12.04 if that matters.</p>