[other] How Ubuntu installer install grub on partition

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http://ubuntuforums.org – Hi guys, i need to make the same things that ubuntu installer make the grub installation on a partition. My problem is that i need to recognize the /boot partition (formatted in ext3) where grub is installed with another bootloader. I tried some distro but only ubuntu installer make it right. I also tried to install grub with blocklist with grub-install --force /dev/sdaXY in /boot and my notebook freeze when it power on (it power on some led and freeze after power on display). Now i ask to someone more expert than me how ubuntu installer install the bootloader. *My disk use GPT. This is my pa (Hardware)