Q: chromedriver in ubuntu 16.04 I install chromedriver and selenium with this way https://gist.github.com/ziadoz/3e8ab7e944d02fe872c3454d17af31a5 
but i have this error when I lunched test behat with brwoser chromium not lunched.
behat.yml:
default:
    suites:
        default:
            bundle: MedBundle
            contexts:
                - test\MedBundle\Behat\Context\FeatureContext
                - test\MedBundle\Behat\Context\AjouterContext
    extensions:
        Behat\Symfony2Extension: ~
        Behat\MinkExtension:
            base_url: http://localhost/test/web/app_dev.php
            goutte: ~
            browser_name: 'chrome'
            javascript_session: selenium2
            selenium2:
                wd_host: http://127.0.0.1:4444/wd/hub
            sessions:
                default:
                    symfony2: ~      

this is problem :
enter image description here
