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ubifs volumes have a UUID and the built-in blkid is able to determine it. The disk/by-uuid symlink isn't created because ubifs volumes are not on block devices but on SUBSYSTEM="ubi" devices. See #20071. Allow ubi subsystem devices to be processed by the persistent storage rules too. The kernel device name matching already allows ubi* to pass. The existing rules are sufficient to create the link. The links look like other by-uuid symlinks, for example: /dev/disk/by-uuid/9a136158-585b-4ba4-9b70-cbaf2cf78a1c -> ../../ubi0_1
Files in this directory contain configuration for systemd-udev.service, a daemon that manages symlinks to device nodes, permissions of devices nodes, emits device events for userspace, and renames network interfaces. See man:udev(7) for an overview of the configuration file format, and man:systemd-udevd.service(8) for a description of service itself. Use 'systemd-analyze cat-config udev/rules.d' to display the effective config.