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  • Your answer could be improved with additional supporting information. Please edit to add further details, such as citations or documentation, so that others can confirm that your answer is correct. You can find more information on how to write good answers in the help center. Commented May 5 at 19:52
  • Does this answer solve the problem of update-grub is showing warning discarded incorrectly nested partition hostdisk/dev/sda,gpt7,bsd(1-14)? Commented May 6 at 4:06
  • @DavidAnderson - No, that still shows, but upon further reading, I found out that Grub complains and rEFInd is recommended. But for now my install and boot of OpenBSD is happening. Commented May 6 at 6:14
  • The rEFInd Boot Manager only works with (U)EFI booting. Notice I stated "BOOT MANAGER". It is not a boot loader. The rEFInd Boot Manager instructs the boot manager built into the (U)EFI firmware as to what to boot next. BIOS firmware has no way to do this. On the other hand, GRUB is a boot loader. GRUB is the acronym for Grand Unified Bootloader. Once you have booted to GRUB, you can use GRUB to boot other operating systems. GRUB can be installed to BIOS or (U)EFI boot. Commented May 6 at 12:23