title: WebDriverException: Message: invalid argument: can't kill an exited process error with Selenium GeckoDriver and Firefox in Google Colab on Ubuntu
body: <p>In a previous post (<a href="https://stackoverflow.com/questions/57528718/what-is-the-executable-path-in-google-colaboratory-for-geckodriver#57553986">enter link description here</a>) the following code (by DebanjanB) </p>
  
  <pre><code># install firefox, geckodriver, and selenium
  !apt-get update
  !pip install selenium
  !apt install firefox-geckodriver
  !cp /usr/lib/geckodriver /usr/bin
  !cp /usr/lib/firefox /usr/bin
  
  from selenium import webdriver
  
  binary = '/usr/bin/firefox'
  options = webdriver.FirefoxOptions()
  options.binary = binary
  options.add_argument('start-maximized')
  options.add_argument('--headless')
  browser = webdriver.Firefox(firefox_options=options, executable_path='/usr/bin/geckodriver')
  browser.get('http://google.com/')
  </code></pre>
  
  <p>which is correct, caused a version problem. I'm not an expert in <strong>Ubuntu</strong>.</p>
  
  <p>I use Google Colaboratory, Python3.6, Selenium3.14.</p>
  
  <pre><code>WebDriverException                        Traceback (most recent call last)
  &lt;ipython-input-2-f7828de5f77c&gt; in &lt;module&gt;()
        4 options.add_argument('start-maximized')
        5 options.add_argument('--headless')
  ----&gt; 6 browser = webdriver.Firefox(options=options, executable_path='/usr/bin/geckodriver')
        7 driver.get("https://www.google.com")
        8 print(driver.page_source)
  /usr/local/lib/python3.6/dist-packages/selenium/webdriver/firefox/webdriver.py in __init__(self, firefox_profile, firefox_binary, timeout, capabilities, proxy, executable_path, options, service_log_path, firefox_options, service_args, desired_capabilities, log_path, keep_alive)
      172                 command_executor=executor,
      173                 desired_capabilities=capabilities,
  --&gt; 174                 keep_alive=True)
      175 
      176         # Selenium remote
  
  /usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webdriver.py in __init__(self, command_executor, desired_capabilities, browser_profile, proxy, keep_alive, file_detector, options)
      155             warnings.warn("Please use FirefoxOptions to set browser profile",
      156                           DeprecationWarning, stacklevel=2)
  --&gt; 157         self.start_session(capabilities, browser_profile)
      158         self._switch_to = SwitchTo(self)
      159         self._mobile = Mobile(self)
  
  /usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webdriver.py in start_session(self, capabilities, browser_profile)
      250         parameters = {"capabilities": w3c_caps,
      251                       "desiredCapabilities": capabilities}
  --&gt; 252         response = self.execute(Command.NEW_SESSION, parameters)
      253         if 'sessionId' not in response:
      254             response = response['value']
  
  /usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/webdriver.py in execute(self, driver_command, params)
      319         response = self.command_executor.execute(driver_command, params)
      320         if response:
  --&gt; 321             self.error_handler.check_response(response)
      322             response['value'] = self._unwrap_value(
      323                 response.get('value', None))
  
  /usr/local/lib/python3.6/dist-packages/selenium/webdriver/remote/errorhandler.py in check_response(self, response)
      240                 alert_text = value['alert'].get('text')
      241             raise exception_class(message, screen, stacktrace, alert_text)
  --&gt; 242         raise exception_class(message, screen, stacktrace)
      243 
      244     def _value_or_default(self, obj, key, default):
  
  WebDriverException: Message: invalid argument: can't kill an exited process
  </code></pre>
  
  <p>I searched the internet and only found that this is a version conflict between Firefox and Geckodriver. But nobody gives the solution how to choose the compatible versions. This is my problem. Any help is appreciated.</p>