I was able to enable upstart and disable systemd with commands that follows, but I was not able to prevent its auto re-installation
apt-get install lxde (I am used to a serious server configuration without complex gui or without gui at all).
Please help: how can I prevent systemd auto installation for both 64 and 32 bit version? Thank you in advance.
apt-get install upstart-sysv sysvinit-utils -y cp /usr/share/sysvinit/inittab /etc/inittab update-initramfs -u reboot
apt-get remove --purge --auto-remove systemd systemd:i386 -y