apache2-dbg 2.4.6-2ubuntu2.1 (arm64 binary) in ubuntu saucy

 The Apache Software Foundation's goal is to build a secure, efficient and
 extensible HTTP server as standards-compliant open source software. The
 result has long been the number one web server on the Internet.
 .
 This package includes the debugging symbols. It can be used to debug
 crashing server instances and modules. See
 /usr/share/doc/apache2/README.backtrace for more information.