I have GRUB2 installed now, do I need to do any of this UEFI stuff?

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https://bbs.archlinux.org – If your machine supports it and Lubuntu follows Ubuntu, it may well be using EFI already. In that case, I think just updating the config for grub should work provided it finds Arch OK. cfr https://bbs.archlinux.org/profile.php?id=54639 2012-09-10T01:29:13Z (HowTos)