title: I can't execute command modprobe vboxdrv
body: <p>I recently upgraded my laravel vagrant box. Since then, Virtual box is giving me the same error</p>
  
  <blockquote>
    <p>The provider 'virtualbox' that was requested to back the machine
    'default' is reporting that it isn't usable on this system. The reason
    is shown below:</p>
    
    <p>VirtualBox is complaining that the installation is incomplete. Please
    run <code>VBoxManage --version</code> to see the error message which should
    contain instructions on how to fix this error.</p>
  </blockquote>
  
  <p>So, making a little research I found that the kernel driver is not available. I tried to install it and give me the following error when it tries to execute <code>modprobe vboxdrv</code>. </p>
  
  <blockquote>
    <p>modprobe: ERROR: could not insert 'vboxdrv': Required key not available</p>
  </blockquote>
  
  <p>I have 4 days with this error and I don't know what to do. Somebody can help me?</p>