Ubuntu boot and upstart

Ubuntu boot process

https://wiki.ubuntu.com/Booting

Upstart intro

http://stackful-dev.com/what-every-developer-needs-to-know-about-ubuntu-upstart.html

Upstart events

http://manpages.ubuntu.com/manpages/precise/man7/upstart-events.7.html

Upstart Cookbook

http://upstart.ubuntu.com/cookbook/upstart_cookbook.pdf

Ubuntu Admin
https://beginlinux.com/server_training/8-ubuntuadmin
http://www.adminbuntu.com