Hello, I have some GRUB related questions.

Say I dual booted Windows 8.1 and Ubuntu Linux, Afterwards would I be able to use commands like "fixboot" and "fixmbr" in order to use the Windows bootloader instead? And would it be safe?

I plan to do the Windows 10 Upgrade, and, If I had that dual boot setup, would it mess up anything?

Thank you.

Hopefully yes. Certainly always worked prior to Win8. Haven't tested it, but no reason to suppose otherwise.

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you can but then you might as well reformat the ubuntu partition ( remove ubuntu)
windows bootloade will NEVER be able to boot Ubuntu


yes OR no

if windows is on the FIRST DRIVE in the bios
and the MS bootloader is on the FIRST partition on the FIRST drive

then NO , you should not have problems related to ubuntu

BUT

if ubuntu is on the FIRST drive and grub is on the FIRST partition

then ....
a ton

dotnet framwork will error
and any service pack will error
and a upgrade will fail

MS checks to MAKE 100%% SURE it is on the first drive
and is the DEFAULT booting

it is a royal pain in the rear end

so just adjust the boot order so that the drive with windows and the windows MBR are the FIRST!!!! option

If I were to dual boot, I guess I would upgrade to Windows 10 and then do the dual boot.