Hi guys,

I install wordpress on Lemp on 16.04 ( this was installed using the via DO droplet) following this tutorial https://www.digitalocean.com/community/tutorials/how-to-install-wordpress-with-lemp-on-ubuntu-16-04 everything went well, but when I changed the permalinks to post-name since then apart from the home page anything else returns with this error ( 404 Not Found nginx/1.10.0 (Ubuntu) ) now I did of course followed the instruction for making changes in the /etc/nginx/sites-available/default take a look at my file below

GNU nano 2.5.3 File: /etc/nginx/sites-available/default

Please see /usr/share/doc/nginx-doc/examples/ for more detailed examples.

Default server configuration

server {
listen 80 defaultserver;
listen [::]:80 defaultserver;
# SSL configuration
#
# listen 443 ssl defaultserver;
# listen [::]:443 ssl defaultserver;
#
# Note: You should disable gzip for SSL traffic.
# See: https://bugs.debian.org/773332
#
# Read up on ssl_ciphers to ensure a secure configuration.
# See: https://bugs.debian.org/765782
#
# Self signed certs generated by the ssl-cert package
# Don't use them in a production server!
#
# include snippets/snakeoil.conf;

    root /var/www/html;

    # Add index.php to the list if you are using PHP
    http {
index index.html index.htm index.php index.nginx-debian.html;

    server_name _;

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

    # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
    #
    #location ~ \.php$ {
    #       include snippets/fastcgi-php.conf;
    #
    #       # With php7.0-cgi alone:
    #       fastcgi_pass 127.0.0.1:9000;
    #       # With php7.0-fpm:
    #       fastcgi_pass unix:/run/php/php7.0-fpm.sock;
    #}

    # deny access to .htaccess files, if Apache's document root
    # concurs with nginx's one
    #
    #location ~ /\.ht {
    #       deny all;
    #}
    location = /favicon.ico { log_not_found off; access_log off; }
    location = /robots.txt { log_not_found off; access_log off; allow all; }
    location ~* \.(css|gif|ico|jpeg|jpg|js|png)$ {
    expires max;
    log_not_found off;

}

I didn't follow the instructions for installing ssl because this is test and I m did made another user with sudo privileges but there was nothing in the tutorial about switching to non root user at any point, so I continued using the root user for all the process.
I m completely new to this so can someone please help me with this. Also I have a sub domain that has it's own WordPress installation but would be placed in the same dictionary and I m also planing on installing Vanilla forum as a subdomain or example.com/forum. For now I m just doing this on test environment using DO droplet and the ip address as the domain.
Thanks in advance for any help.