A new Debian Linux update has been published: ELA-567-2 apache2 regression update
An Apache2 regression update has been released for Debian GNU/Linux 8 Extended LTS to address the issue with the "Cannot load /usr/lib/apache2/modules/mod_proxy.so into server: /usr/lib/apache2/modules/mod_proxy.so: undefined symbol: ap_proxy_de_socketfy" error.Read more @ Linux Compatible