I used “Aomei Partition Assistant”, booted from a USB stick, to make backup clones of my “/”, “/boot/efi”, and “/home” partitions. And that worked fine. But wow, when that program says “clone”, it means verbatim clone, including UUIDs. So now the UUIDs of my root, boot, and home partitions are duplicated in my backup copies.
The system was getting confused and mounted the wrong partitions to “/”, “/boot/efi”, and “/home” on next startup. So I had to change the “UUID=xxxxxx” in several fstab lines to “PARTUUID=xxxxxx” instead (the PARTUUIDs were not duplicated), and that fixed that problem.
So, I have two questions:
Can such duplicate partition UUIDs cause problems (other than causing wrong partitions to be mounted at startup)?
Can UUIDs of partitions be changed? If so, how?