Hello Linux Geeksters. While Debian 8.0 Jessie and Ubuntu 15.04 Vivid Vervet have adopted systemd over Upstart, Ubuntu 14.10 and the official flavors still use Upstart.
Many popular Linux systems like Arch Linux, OpenSUSE, Fedora or Red Hat use systemd, but there are also others that still prefer the good old upstart (sysVinit).
The default init system (either /sbin/systemd or /sbin/upstart) run with PID 1 as /sbin/init).
To install and use systemd on Ubuntu 14.10 or a derivative system, do:
$ sudo apt-get install systemd-sysv
$ sudo apt-get remove upstart-sysv
$ sudo update-initramfs -u
$ sudo reboot
Reboot and choose *Ubuntu, … (systemd) from your grub menu.