Anaconda navigator打不开，于是在Anaconda Prompt进行以下更新命令：
 

conda update anaconda-navigator

却报错显示如下：

ProxyError: Conda cannot proceed due to an error in your proxy configuration.
Check for typos and other configuration errors in any '.netrc' file in your home directory,
any environment variables ending in '_PROXY', and any other system-wide proxy
configuration settings.

上网搜索解决方法，发现是代理服务器开了的原因：

将其关闭后，即可正常更新：