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0e1f616
(Get the code!)
What do you mean by "not booting the way it boots from menu.lst"? What exactly is different? In particular, does grub-pc *work* - as in: does it successfully load Ubuntu?
Grub2 doesn't use menu.lst; it does have its own configuration.
As to your other questions:
*) It sets root=(hd0,1) because grub2 starts partition numbering at 1, not 0
*) The "search --fs-uuid --set" line is searching for your /boot partition by UUID, and setting it to the root if it finds it.
The only influence the bootloader has on the usplash theme is (a) whether it's on or not, and (b) the root partition that you're booting from. Since you've set menu.lst to not show the splash, it obviously won't be shown under grub legacy. You haven't disabled the splash under grub2, so the usplash will be shown.
Finally; I don't think the UUIDs of your drives are a particular concern, but the UUID of your root drive is still in the menu.lst you posted. And the UUID of your / partition is in grub.cfg.