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Re: Dual boot: one legacy, the other uefi

On Sun, 6 Oct 2019 17:45:37 -0300
Beco <rcb@beco.cc> wrote:

> Hi guys,
> I have this laptop problem to solve: the original windows 10 is kept,
> shrunk partition to 1TB, originally cryptographied (but now normal).
> The rest was given to Linux, Debian 10: 800GB root and 8.2GB swap.
> Now the system can boot both systems ok. But to choose which one you
> want, you need to enter the BIOS, change legacy to UEFI, and
> vice-versa, then you can boot.
> Not a good way to keep.
> Lets give the devices some names.
> /dev/sda4 is windows 10
> /dev/sda5 is debian buster 10
> /dev/sda6 is swap
> Other partitions are the usual that comes with a Windows Dell laptop
> (boot, backup, etc.)
> Grub is installed at sda5 with Debian, but when updated it doesn't
> recognize A Windows partition.
> Can you point me to a possible howto, blog, set of instructions or
> even abstract ideas that are in the right direction?

Installation notes for Debian 10, on the Debian website.

I installed stretch (stable at the time) on a Win10 netbook without
problems. There is no legacy BIOS in that machine, so Debian had to be
installed UEFI and it Just Worked. The grub menu lists the Windows boot
manager underneath the Debian entry.

There will be a UEFI partition apart from those you named, Windows
requires it and Debian can use it. Certainly stretch was UEFI-enabled,
so I assume buster is also.


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