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