root@redmine:~# dpkg -l | grep apache2
ii  apache2                            2.4.10-10+deb8u7                  amd64        Apache HTTP Server
ii  apache2-bin                        2.4.10-10+deb8u7                  amd64        Apache HTTP Server (modules and other binary files)
ii  apache2-data                       2.4.10-10+deb8u7                  all          Apache HTTP Server (common files)
ii  apache2-dev                        2.4.10-10+deb8u7                  amd64        Apache HTTP Server (development headers)
ii  apache2-mpm-prefork                2.4.10-10+deb8u7                  amd64        transitional prefork MPM package for apache2
ii  apache2-utils                      2.4.10-10+deb8u7                  amd64        Apache HTTP Server (utility programs for web servers)
ii  libapache2-mod-passenger           4.0.53-1                          amd64        Rails and Rack support for Apache2