It seems that our apache isn't compiled with systemd support or systemd is not correctly detected at runtime. Type=notify in the unity requires the process to call sd_notify() when it's done setting up the sockets. Can you try changing it to Type=simple and do:
# systemctl daemon-reload # systemctl restart apache2 The unit is at /usr/lib/systemd/system/apache2.service -- Fabio Erculiani
