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 [sourcecode] apt-get install upstart-sysv [/sourcecode] Beware! You will remove only ubuntu-standard and systemd-sysv packages. Don't remove any packages beside that two packages. - Run initramfs again: [sourcecode] sudo update-initramfs -u [/sourcecode] Do with your own risk!