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Ubuntu partition. If you have a separate boot partition, well need to mount it in mntboot as well sudo mount devsd mntboot. This should mount it with enough access to get the canonical path if needed, but well likely not need this. To finish up, just update grub with the correct root and target sudo grub install root directorymnt devsd. X. where devsd. X is the disknot the partition where we want GRUB.