使用chromedriver 2.20和selenium server 2.48.2，测试失败，“Chrome启动失败:异常退出”

I am trying to run headless chrome tests on Ubuntu 14.04.3 using Selenium grid that sits on AWS EC2 server but cannot successfully run any test. I have been looking around for answers, tried many solutions/suggestions, but still failed. The closest answer I can get is that the chromedriver and selenium server versions were out of sync that's why I am getting this kind of error.I am trying to run headless chrome tests on Ubu