nginx-core-dbg 1.10.3-0ubuntu0.16.04.5 (amd64 binary) in ubuntu xenial

 Nginx ("engine X") is a high-performance web and reverse proxy server
 created by Igor Sysoev. It can be used both as a standalone web server
 and as a proxy to reduce the load on back-end HTTP or mail servers.
 .
 This package provides debugging symbols for nginx-core, to assist in debugging
 issues that you may find. It should not be required for normal operation.