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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