title: WebDriverError error: Chrome failed to start: exited abnormally
body: <p>I'm trying to run protractor test on ubuntu 14.04 vm (by google cloud),
  for some reason when i run 'protractor conf.js' i get an error says:</p>
  
  <p><strong>E/launcher - WebDriverError: unknown error: Chrome failed to start: exited abnormally</strong></p>
  
  <p>I followed this tasks in order to install headless chrome:
  <a href="https://gist.github.com/alonisser/11192482" rel="nofollow noreferrer">https://gist.github.com/alonisser/11192482</a></p>
  
  <ul>
  <li><p>Before running protractor cons.js, i'm running <i>"webdriver-manager start"</i></p></li>
  <li><p>When i run 'Xvfb -ac :2 -screen 0 1280x1024x16' its freeze when gets to
  'Initializing built-in extension GLX'</p></li>
  <li><p>I also tried change the conf.js to
  chromeOptions: {
     args: [ "--headless", "--disable-gpu", "--window-size=800x600" ]'
  but and protractor print 'start' then error: 'Failed: unknown error: an X display is required for keycode conversions, consider using Xvfb'</p></li>
  <li><p>It's important to mention that it's all worked great, before a couple hours.
  then i just let my mac sleep, and of course it was exit the vm..</p></li>
  <li><p>I'm running the same tests with protractor in my mac and its works great.
  <strong>the problem is related to chrome/chromeDriver on the instance vm.</strong></p></li>
  </ul>
  
  <p>thanks a lot!!!</p>