This may be related to having an older machine that doesn't support EFI boot.
To solve the problem:
1) Create a partition that is of type bios boot (I believe it needs to be 2K)
2) Create a regular boot partition /boot (I recommend ext4 or 3)
3) Create your other partitions per normal.
To solve the problem: 1) Create a partition that is of type bios boot (I believe it needs to be 2K) 2) Create a regular boot partition /boot (I recommend ext4 or 3) 3) Create your other partitions per normal.