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Groups > linux.debian.user > #242612 > unrolled thread

Double boot (Windows & Debian) with UEFI mode

Started byfrantal@libero.it
First post2021-12-02 10:40 +0100
Last post2021-12-02 13:20 +0100
Articles 2 — 2 participants

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  Double boot (Windows & Debian) with UEFI mode frantal@libero.it - 2021-12-02 10:40 +0100
    Re: Double boot (Windows & Debian) with UEFI mode Greg Wooledge <greg@wooledge.org> - 2021-12-02 13:20 +0100

#242612 — Double boot (Windows & Debian) with UEFI mode

Fromfrantal@libero.it
Date2021-12-02 10:40 +0100
SubjectDouble boot (Windows & Debian) with UEFI mode
Message-ID<DpQJj-5W9-1@gated-at.bofh.it>

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Hello,

yes HD is 1TB and Debian partition is 300GB (not Mb).

Currently Windows starts directly without reporting other OSes present.

So should I use the installation disk in "rescue mode" and reinstall Grub to Debian's / partition (27.94 GiB dev/sda6)?

How to install os-prober?

I think I have to be able to boot Debian first to be able to install it later.

Right?

Francesco

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#242616

FromGreg Wooledge <greg@wooledge.org>
Date2021-12-02 13:20 +0100
Message-ID<DpTea-7up-5@gated-at.bofh.it>
In reply to#242612
On Thu, Dec 02, 2021 at 10:37:38AM +0100, frantal@libero.it wrote:
> How to install os-prober?

apt install os-prober

> I think I have to be able to boot Debian first to be able to install it later.
> 
> Right?

Yes.  Either boot Debian natively, or boot some sort of rescue system,
mount the Debian root partition (and /boot if you have a separate /boot),
chroot into the Debian system, and then install os-prober there.

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