Use ubuntu-xx.xx.x-server-amd64.iso instead of ubuntu-xx.xx.x-live-server-amd64.iso.
Select Primary rather than Logical, as shown in the following figure.
The preceding figures show how to create the boot partition and are also applicable to swap and / partitions. The following figures show the partitioning results (root partition is the last partition).
Install predefined software.
Install GRUB on your hard disk.