Bug#980782: Info received (Bug#980782: Acknowledgement (os-prober: linux-boot-prober returning "root=/dev/dm-X" line instead of expected "root=UUID=[UUID128]))
Looking at /usr/share/initramfs-tools/scripts/local-top/lvm2 more
closely, passing a UUID also wouldn't trigger a `vgchange -ay` here.
But a path like /dev/mapper/X would.
So maybe the question is rather: how to make os-prober return a
"root=/dev/mapper/X" line instead of one containing a UUID(?)