I was wrong; Phillip identified this correctly as being due to a bug in avoid-disturbing-partitions.patch in the case where some of the partitions in the new layout start at the same position as partitions of the same number in the old layout but extend over parts of the disk previously occupied by partitions of higher numbers. He's working on a patch to reorder the remove/add code to avoid this.
** Changed in: parted (Ubuntu) Status: Triaged => In Progress -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1220165 Title: Error informing the kernel about modificatons To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/parted/+bug/1220165/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs