I'm trying to move to grub2 and while chainloading from legacy grub works fine, I'm not sure how to move completely. Old grub was installed in boot sector of swap partition, /dev/sda3, and was working fine there. I want new grub to be installed there as well but during upgrade-from-grub-legacy it suggest to install at MBR or at ubuntu root partition, /dev/sda4. How do I force it to install at /dev/sda3? Can I just do grub-install '(hd0,3)' instead of upgrade-from-grub-legacy?
If you have verified that the new grub2 setup works, you can use grub-install safely.
The only significant thing upgrade-from-grub-legacy does is this:
rm -f /boot/grub/{{xfs,reiserfs,e2fs,fat,jfs,minix}_stage1_5,stage{1,2}}
which essentially removes the grub-legacy files from /boot/grub, you can also remove /boot/grub/menu.lst if it doesn't contain anything important to you.
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