Hi Stephan, thank you for your detailed explanation. I really appreciate it. Personally speaking, as long as the issue 3 in Comment #0 has been tracked in bug 1087763, this is no longer a problem for me. I really love to use the guided partitioner or expert partitioner. I agree with the philosophy of keeping things simple but working. Furthermore, I did not issue this bug just for me myself as I knew that the original partition scheme in my case is really an edge situation and I knew enough to partition manually. After reading your explanation I understand that why did the partitioner propose to delete /dev/sda4. It is because /dev/sda4 is at the end of sectors. It blocks the automatic deletion of (original) /dev/sda7 and the creation of new partitions for Linux on it. If it is not possible to delete the last data partition to create new partitions for Linux but preserve the end (very last but hidden) partition of Windows Recovery, please just leave it. But the Windows Recovery partition, which is at the end of the disk, is true the factory configuration of that laptop. Then, issue 1 might caused by the fact that there are too many primary partitions. This makes it an edge case. So please leave it, too. In the end, if no further discussion is expected in this thread, please feel free to close it.