title: Oracle VirtualBox Problems in update
body: <p>I've been using <em>Oracle VirtualBox</em> for a while but now I've downloaded Genymotion Emulator and it asked me to update the vitrualbox but whenever I click on the update or to check Network Operation Manager I got this error <strong>Oracle virtualbox the network operation failed with the following error unknown reason</strong>
  I've checked the the virtualbox forums through <a href="https://forums.virtualbox.org/" rel="nofollow">https://forums.virtualbox.org/</a> but didn't find the solution I found many people asking this question but there are no convincing solutions.</p>
  
  <p>If you have any suggestions about good <strong>virtual machines</strong> which I can use it for Genymotion to test my android apps which are done by eclipse.</p>
  
  <p>Thanks in advance.</p>