nginx: [emerg] "fastcgi_pass" directive is duplicate in /etc/nginx/sites-enabled/default:57

/************************************************************************************************
 *  nginx: [emerg] "fastcgi_pass" directive is duplicate in /etc/nginx/sites-enabled/default:57
 * 說明：
 *     VPS安裝Ubuntu 16.04，調一下Nginx的PHP Server。
 *
 *                                              2017-9-26 深圳 龍華樟坑村 曾劍鋒
 **********************************************************************************************/

一、參考文檔：
    1. 啟動 nginx 失敗 "fastcgi_pass" directive is duplicate
        http://www.cnblogs.com/cgjcgs/p/5310031.html

二、錯誤現象：
    root@localhost:/var/www/html# systemctl status nginx.service
    鈼?[0m nginx.service - A high performance web server and a reverse proxy server
       Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled)
       Active: failed (Result: exit-code) since Tue 2017-09-26 01:45:11 EDT; 1min 20s ago
      Process: 345 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process on; (code=exited, status=1/FAILURE)

    Sep 26 01:45:11 localhost systemd[1]: Starting A high performance web server and a reverse proxy server...
    Sep 26 01:45:11 localhost nginx[345]: nginx: [emerg] "fastcgi_pass" directive is duplicate in /etc/nginx/sites-enabled/default:57
    Sep 26 01:45:11 localhost nginx[345]: nginx: configuration file /etc/nginx/nginx.conf test failed
    Sep 26 01:45:11 localhost systemd[1]: nginx.service: Control process exited, code=exited status=1
    Sep 26 01:45:11 localhost systemd[1]: Failed to start A high performance web server and a reverse proxy server.
    Sep 26 01:45:11 localhost systemd[1]: nginx.service: Unit entered failed state.
    Sep 26 01:45:11 localhost systemd[1]: nginx.service: Failed with result 'exit-code'.

三、解決辦法：
    1. 修改文件：/etc/nginx/sites-enabled/default
    2. 如下：
        location ~ \.php$ {
            ...
            #    fastcgi_pass 127.0.0.1:9000; （此處和下面重復，注釋掉）
            #    # With php5-fpm:
                fastcgi_pass unix:/var/run/php5-fpm.sock;（此處和上面重復）
            ...
        }