安装Webmin后提示your system is not ready for use by Virtualmin的解决方法

在某些服务器或VPS中安装Webmin后，进入Webmin后台Checking Configuration时，会提示

The mailman queue processor /usr/lib/mailman/bin/qrunner is not running on your system. It can be started in the Bootup and Shutdown module.
.. your system is not ready for use by Virtualmin.

解决办法：点击Bootup and Shutdown的链接直接进入，或者从左侧导航菜单中找到Webmin ==> System ==> Bootup and Shutdown，再从Service name列表中找到mailman，启动即可。

这时再次Checking Configuration，会提示

your system is ready for use by Virtualmin.

已经可以正常使用Virtualmin/Webmin了。