It looks like the installer just reads the partition info and calculates a rough sizes of partitions, and then partitions the disk again by those rough sizes.
I even partitioned the disk with fdisk using block counts, but after installing, I saw that the block numbers had changed ALWAYS causing:
(Start sector of partition 3 changed from 243273728 to 243275774 and there was originally 2048 block space between partition 2 and 3.)Partition 3 does not start on physical sector boundary.
My partition #3 is extended partition.
It lookss like if I opened the "change"-view, the partitioning changes. But without opening it, I don't know how to specify the mount points.
(Especially when I have multiple Linux-partitions.)
I know that the error message from "fdisk -l" is not serious, but it irritates me. It means that some older tools may not work right.
First I partitioned, then rebooted, then checked the partitions - all well this far, but after installing, the partitions had changed.