How to Switch Back to Upstart in Ubuntu 15.04

This is simple tutorial for you to switch back init system of Ubuntu 15.04 to using Upstart.

For one boot only (not permanent):
– In Grub loading page, select “Advanced Option for Ubuntu”
– Choose “Ubuntu, with Linux kernel xxxx (upstart)
– Press enter key or boot for that option

For permanent using of Upstart:
– Login to your rig,
– Install upstart-sysv with apt-get
apt-get install upstart-sysv

Beware! You will remove only ubuntu-standard and systemd-sysv packages. Don’t remove any packages beside that two packages.
– Run initramfs again:
sudo update-initramfs -u

Do with your own risk!