Unable to install grub in /dev/sda

[Liam Proven]

On Mon, 18 Oct 2021 at 05:19, Phil Fraser <phillor9 at gmail.com> wrote:
>
> Liam, you ask a number of questions, one was "is Windows 10 installed as uefi". How can I tell?

https://www.easyuefi.com/resource/check-windows-is-booted-in-uefi-mode.html

(First hit for on Google for "how to tell if windows is in bios or
uefi" -- I didn't get as far as the word "mode". :-)

> I have Windows 10 on a usb stick and I just followed the prompts.

Your disk is in "dos" mode according to your partition list. That
means an MBR partitioning scheme. Therefore it's in Legacy Boot mode,
because apparently Win10 will not install onto GPR in BIOS mode:

https://www.aioboot.com/en/windows-10-gpt-legacy-bios

Some computers' firmware can boot off GPT in BIOS mode but apparently
Microsoft doesn't trust this to work reliably which is fair enough.

> At the time I had Kubuntu 20.10 installed and it was unaffected by the Windows upgrade.

All Ubuntus *should* react the same.

>  Did you install Windows 10 from a usb stick, if so how?

I use a tool called Ventoy which lets you just copy ISO files onto a
big stick, and it automagically generates a boot menu for them all
when you boot the computer from it. The menu lets you pick which ISO
and it boots. It's very handy.

https://www.ventoy.net/en/index.html


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