In general, filesystems are listed in /etc/fstab by UUID rather than by device name, to ensure that the filesystem can always be found reliably. If you are mounting a filesystem located on LVM, however, it is recommended that you list them in /etc/fstab by device name, not by UUID, because UUIDs are not unique if LVM snapshots are used, which can result in wrong filesystems being mounted at boot. (563902)
Documented in the release notes at <https:/ /wiki.ubuntu. com/LucidLynx/ ReleaseNotes# LVM%20filesyste ms%20should% 20be%20listed% 20in%20/ etc/fstab% 20by%20name>:
In general, filesystems are listed in /etc/fstab by UUID rather than by device name, to ensure that the filesystem can always be found reliably. If you are mounting a filesystem located on LVM, however, it is recommended that you list them in /etc/fstab by device name, not by UUID, because UUIDs are not unique if LVM snapshots are used, which can result in wrong filesystems being mounted at boot. (563902)