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I have read many articles about the Linux boot process. As I understand the Linux boot process is something like this :

BIOS (UEFI) → MBR → grub → Kernel → init  

What I really don't understand what the etc/sbin/init starts and what the relation between the Ubuntu upstart daemon, /etc/init.d and run levels is...

1 Answer 1

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2 resources that will help you understand the boot process better:

  1. bootchart

    sudo apt-get install bootchart
    sudo reboot
    

    Now every time a chart like this one will be created in /var/log/bootchart/ every time you reboot. You can learn a lot by looking at a boot chart of a system you know intimately: yours! ;-)

  2. IBM's manual Inside the Linux Boot Process

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