That's my default.conf ;


server {
listen 80;
server_name mydomain.com www.mydomain.com;

#charset koi8-r;

#access_log logs/host.access.log main;

location / {
root /usr/share/nginx/html;
index index.html index.htm index.php;
}

error_page 404 /404.html;
location = /404.html {
root /usr/share/nginx/html;
}

# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root /usr/share/nginx/html;
}

# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}

# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
location ~ \.php$ {
root /usr/share/nginx/html;
fastcgi_pass 127.0.0.1:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
include fastcgi_params;
}

What exact error do you get?

On Ubuntu, you have to create the info.php file, manually. See How To Install Linux, nginx, MySQL, PHP (LEMP) stack on Ubuntu 12.04.