To be able to triple boot on a single hard drive connected to an Arous, Gigabyte, or MSI motherboard, you will need to boot Clover EFI from a USB Flash Drive. Set that USB Drive with the Clover bootloader as first in your BIOS. This ensures GRUB and the Windows Boot Manager on the single hard drive will not be in conflict with the Clover bootloader. To skip the USB Flash Drive and prevent the bootloaders from clashing, you can install each OS on their own HDD or SSD for a total of three drives. To do this with two drives, install Windows (and Windows Boot manager) and then Ubuntu (and Grub) on your second drive and macOS (and Clover) on your first drive and set your BIOS to boot Clover from the primary drive.
Triple Boot on a Single Drive
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About The Author: Stephan Pringle is an Information Technology Support Specialist. He covers hardware and software and provides tips for you to troubleshoot and repair issues on your own. In his spare time, he writes articles about the State of New York on his Hackintosh and HackBook and that has helped him to become the top contributor of the New York City section of Yahoo! Answers.