title: selenium.common.exceptions.WebDriverException: Message: unknown error: Chrome failed to start: exited abnormally
body: <p>The code is :</p>
  
  <pre><code>import os
  from selenium import webdriver
  chromedriver = "/usr/bin/chromedriver"
  os.environ["webdriver.chrome.driver"] = chromedriver
  driver = webdriver.Chrome(chromedriver)
  driver.get("http://stackoverflow.com")
  driver.quit()
  </code></pre>
  
  <p>run python name.py</p>
  
  <p>return the message </p>
  
  <pre><code>File "test_chr.py", line 6, in &lt;module&gt;
      driver = webdriver.Chrome(chromedriver)
    File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/chrome/webdriver.py", line 69, in __init__
      desired_capabilities=desired_capabilities)
    File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 92, in __init__
      self.start_session(desired_capabilities, browser_profile)
    File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 179, in start_session
      response = self.execute(Command.NEW_SESSION, capabilities)
    File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/webdriver.py", line 236, in execute
      self.error_handler.check_response(response)
    File "/usr/local/lib/python2.7/dist-packages/selenium/webdriver/remote/errorhandler.py", line 192, in check_response
      raise exception_class(message, screen, stacktrace)
  selenium.common.exceptions.WebDriverException: Message: unknown error: Chrome failed to start: exited abnormally
    (Driver info: chromedriver=2.27.440175 (9bc1d90b8bfa4dd181fbbf769a5eb5e575574320),platform=Linux 4.4.0-64-generic x86_64)
  </code></pre>
  
  <p>my selenium version 
  Successfully installed selenium-3.0.2</p>
  
  <p>ubuntu@ip-172-31-30-227:/usr/bin$ chromedriver -version
  ChromeDriver 2.27.440175 (9bc1d90b8bfa4dd181fbbf769a5eb5e575574320)</p>
  
  <p>google-chrome  -version</p>
  
  <p>Google Chrome 56.0.2924.87 </p>
  
  <p>I have no idea how to fix the problem </p>