如果注册github时出现
Unable to verify your captcha response. Please visit https://docs.github.com/articles/troubleshooting-connectivity-problems/#troubleshooting-the-captcha for troubleshooting information.
give it a try
sudo gedit /etc/hosts
在文件末尾添加形如
140.82.112.4 octocaptcha.com
具体ip在ipaddress中查询
保存后
/etc/init.d/network-manager restart