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You have two UUID's for each encrypted partition. UUID of file system Used in /etc/fstab and by GRUB (so don't forget use sudo update-grub after change). Could be changed with: sudo tune2fs ‐U "<fsUUID>" /dev/mapper/<luksUUID> ...where is UUID of corresponding LUKS partition (could look for it in /etc/crypttab) and <fsUUID> is file ...


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Answers Q1-4: It's not. Right tool should be used for specific purpose. See below. Q5: System using systemd are developed enough to show no difference. Q6: In common case - neither. They are both stored in the same place (formatting header or so) and changed by the same mechanism. Q7: No. Partition UUID can be only changed directly (see below) or by ...



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