首先下载Chrome Driver（Firefox Driver的安装与该步骤相同）
链接：
http://chromedriver.storage.googleapis.com/index.html
接下来在控制台（terminal）上操作一下红色字体的指令：
- Install Unzip
sudo apt-get install unzip
- Assuming you’re running a 64-bit OS, download the latest version of chromedriver from their website
wget -N http://chromedriver.storage.googleapis.com/2.10/chromedriver_linux64.zip -P ~/Downloads
unzip ~/Downloads/chromedriver_linux64.zip -d ~/Downloads
- Make the file you downloaded executable, and move it to
/usr/local/share
chmod +x ~/Downloads/chromedriver
sudo mv -f ~/Downloads/chromedriver /usr/local/share/chromedriver
- Also, create symlinks to the chromedriver. Cucumber would look for the drivers in
/usr/bin/chromedriver
sudo ln -s /usr/local/share/chromedriver /usr/local/bin/chromedriver
sudo ln -s /usr/local/share/chromedriver /usr/bin/chromedriver