(there is no boot loader section in the Ubuntu installation process .. why is that ? )
When all the pre-installation configuration questions have been asked and answered, Ubuntu presents a summary of all the decisions you made before going ahead with the installation. At the bottom of that particular window is a button called "Advanced", this is where you'll find it automatically selects hd0 as the drive to install grub, and this is where you can change it if you like.
Hd0 is the first drive set to boot in the bios, normally, that would be the drive with the operating system you had before creating a dual boot.
I just installed the same OS in my laptop, because I have a "better" boot manager already installed, I tried to set grub to install to the Ubuntu partition, it always produced an error and aborted the installation. I kind of like Ubuntu, but no matter what version I've installed, it's always the same story, "NO INSTALLING GRUB TO PARTITION, ONLY MBR OR I GIVE YOU THE FINGER".
Boot up into a live session with the CD and run the four commands below to install it where you want it. First you'll have to run command: fdisk -l
to figure out which drive is which and where your Ubuntu /boot partition is. I'll assume it's /dev/sdc1 for the root command in the example below, correct it to match what you found with the fdisk -l command:
Grub counts from "0", hd2 is the third drive (/dev/sdc), hd0 is the first, which is where the computer will look for a boot loader.
If you screwed up your Windows partition and it won't boot, you'll have to repair it first, then repair grub.