FYI :
>> I want to know what are the exact modules that are included in the pre built Ubuntu version, where can I see that?

What I mean is when I built on my ubuntu I gave the command :
./configure --prefix=/data/apps/ngx/n1_12_0 --with-debug --with-threads --with-file-aio --with-ipv6 --with-http_ssl_module --with-http_v2_module

Notably not used:
--with-http_realip_module

What is the configure command in the pre-built Ubuntu package ? I guess its the same options for all platforms?