我已经在“/var/www”文件夹中安装了laravel，但我得到了403禁止错误，并且“var/www”文件夹中的文件夹有一个锁图标。如何解决此问题？
设置如下：

# Don't use them in a production server 
    root /var/www/html;

    # Add index.php to the list if you are using PHP
    index index.php index.html index.htm;

    server_name 192.168.1.6;

    location / {
            # First attempt to serve request as file, then
            # as directory, then fall back to displaying a 404.
            try_files $uri $uri/ /index.php?$query_string;
    }

    # pass PHP scripts to FastCGI server
    #
    location ~ \.php$ {
            include snippets/fastcgi-php.conf;
    #
    #       # With php-fpm (or other unix sockets):
            fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
    #       # With php-cgi (or other tcp sockets):
    #       fastcgi_pass 127.0.0.1:9000;
    }

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    location ~ /\.ht {
            deny all;
    }
}