Configuring GURB after Fedora 12 dual boot

[Herman]

The /etc/resolve.conf step is for networking.
Sometimes it's useful to be able to have access to the internet and it's possible to fix a damaged operating system in some cases by getting updates. For example, if the power was suddenly disconnected while somebody was getting some updates to vital operating system files and the operating system can't reboot normally because it is missing some important parts. A person might be able to chroot from a Live CD and finish getting the updates which will fix the operating system so it can boot normally again.
You were right to realize that the /etc/resolve.conf step is not necessary just for running grub-install.

I presume you're booting your second hard disk from the BIOS boot menu. Does your operating system boot the way you want it to now?

[Emmtor]

I am so silly..I didn't try booting from my other disk.
Yes, everything works fine now. Thanks for everything Herman!

Initially, I thought that since I (thought I) had left my other hard disk intact, booting from the other hard disk would boot me directly into Ubuntu.
Looks like I have a lot to learn.

[Herman]

I don't know what you have in the first hard disk, but most people would find it more convenient to install GRUB to /dev/sda, (meaning the first hard disk MBR), so as to avoid the extra work of using the BIOS boot menu when they want to boot Ubuntu.
It generally doesn't hurt and may turn out to be useful to have GRUB installed in all hard disk MBRs if your computer has more than two. That way if you add or remove a hard disk or change the BIOS boot order somehow your computer will still boot to GRUB and you'll be able to boot your Ubuntu operating systems from GRUB. The reverse would not be true though, if you remove the Ubuntu hard disk you wouldn't be able to boot Windows if Ubuntu's GRUB is written to MBR in the other hard disk, since the main working parts of GRUB would have been removed with the Ubuntu disk.

If you have a MacInstosh instead of a PC, ( an EFI instead of a BIOS and MBR), or if your computer has some kind of full disc encryption like Windows ''BitLocker' or some other brand, then you probably shouldn't install GRUB to MBR in that disc. If you have an old model Toshiba Laptop with 'Express Media Player' installing GRUB to MBR can cause problems in some models, or if you have 'Ontrack Disc Manager', you probably should avoid installing GRUB to MBR without learning more about it first.
Those instance do exist, but they're rare, and you would know it if your computer had any of that software, (because you would have paid extra money for it).

It's safe to install GRUB to MBR in all hard disks in almost all PCs since Windows boots from its 'boot sector', (the first sector of its partition).
Writing GRUB to MBR doesn't affect Windows at all in most computers, since the MBR is a long way from the Windows boot sector.
A lot of people get the terms 'boot sector' and 'MBR' confused, or use them interchangeably. I would agree that the MBR is a special kind of boot sector, but the MBR contains the partition table and there is only one MBR per hard disk. There can be lots of partitions in the hard disk with boot sectors in each of them.
It's perfectly safe to write GRUB to MBR (the first sector of the hard disk), in a hard disk that has Windows in it, but it is a bad idea to write GRUB to the Windows boot sector, (the first sector of the partition). Writing GRUB to MBR does not harm the MBR's unique ID number which Microsoft decided to make Vista and 7's boot loader sensitive to.