安装mysql的时候，遇到了这样一个错误：
perl: warning: Setting locale failed.

perl: warning: Please check that your locale settings:

    LANGUAGE = (unset),

    LC_ALL = (unset),

    LANG = "en_US.UTF-8"

are supported and installed on your system.

perl: warning: Falling back to the standard locale ("C").

实际上，在stackooverflow上，有很多解决方法，我的解决方法如下：

https://*.com/questions/2499794/how-to-fix-a-locale-setting-warning-from-perl/7413863

自己测试的方法如下：

sudo locale-gen en_US en_US.UTF-

sudo dpkg-reconfigure locales

　　参考文档：

1 https://*.com/questions/2499794/how-to-fix-a-locale-setting-warning-from-perl/7413863