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Moving dual boot Win10 & Debian 10 system from Legacy to UEFI

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  Moving dual boot Win10 & Debian 10  system from Legacy to UEFI "Juan R. de Silva" <juan.r.d.silva@gmail.com> - 2021-07-05 01:30 +0200
    Re: Moving dual boot Win10 & Debian 10 system from Legacy to UEFI David Christensen <dpchrist@holgerdanske.com> - 2021-07-05 02:30 +0200
      Re: Moving dual boot Win10 & Debian 10 system from Legacy to UEFI "Juan R. de Silva" <juan.r.d.silva@gmail.com> - 2021-07-05 03:30 +0200
    Re: Moving dual boot Win10 & Debian 10  system from Legacy to UEFI Anssi Saari <as@sci.fi> - 2021-07-06 21:20 +0200
      Re: Moving dual boot Win10 & Debian 10  system from Legacy to UEFI "Juan R. de Silva" <juan.r.d.silva@gmail.com> - 2021-07-06 22:50 +0200
        Re: Moving dual boot Win10 & Debian 10  system from Legacy to UEFI Anssi Saari <as@sci.fi> - 2021-07-06 23:20 +0200

#236875 — Moving dual boot Win10 & Debian 10 system from Legacy to UEFI

Hi folks,

I dual boot Debian 10 with Windows 10 from MBR in Legacy mode on my 6 
years old Dell M4800 workstation. The BIOS supports both Legacy and UEFI 
modes. With upcoming Windows 11 I am compelled to switch to UEFI mode.

I know how to switch stand alone Windows 10 or stand alone Linux from 
Legacy to UEFI mode. However I have not found how to do such conversion 
in case of existing dual boot install. I am not even sure if it is 
possible at all. 

I would endure Debian reinstall but unfortunately reinstall of Windows 10 
is not an option for me.

For now I'm planning to try the following:
- Wipe out Debian.
- Move Windows to free enough space and create a new GPT partition.
- Switch Windows to UEFI mode.
- Create new partition of suitable size and restore existing Debian image.
- Boot from any Linux Live-CD and install EFI GRUB module to restored 
Debian. (Another option would be installing EFI module in existing Debian 
system in advance and to make an image of it.) Reinstall GRUB.

Do you guys think it is actually feasible? Anybody can suggest something 
easier, smarter? It's a lot of work to do... :-(

Thanks.

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#236878 — Re: Moving dual boot Win10 & Debian 10 system from Legacy to UEFI

On 7/4/21 4:22 PM, Juan R. de Silva wrote:
> Hi folks,
> 
> I dual boot Debian 10 with Windows 10 from MBR in Legacy mode on my 6
> years old Dell M4800 workstation. The BIOS supports both Legacy and UEFI
> modes. With upcoming Windows 11 I am compelled to switch to UEFI mode.

<snip>

Dell Precision M4800 laptops have 4th generation Intel Core processors 
[1] and Windows 11 does not support them [2].  So, even if you succeed 
in converting your Windows 10 / Debian 10 dual boot from BIOS/MBR to 
UEFI/GPT, you will not be able to run Windows 11 on that computer.


David


[1] 
https://www.dell.com/learn/us/en/08/business~smb~merchandizing~en/documents~dell_precision_m4800_spec_sheet.pdf

[2] 
https://docs.microsoft.com/en-us/windows-hardware/design/minimum/supported/windows-11-supported-intel-processors

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#236880 — Re: Moving dual boot Win10 & Debian 10 system from Legacy to UEFI

On Sun, 04 Jul 2021 17:23:33 -0700, David Christensen wrote:

> On 7/4/21 4:22 PM, Juan R. de Silva wrote:
>> Hi folks,
>> 
>> I dual boot Debian 10 with Windows 10 from MBR in Legacy mode on my 6
>> years old Dell M4800 workstation. The BIOS supports both Legacy and
>> UEFI modes. With upcoming Windows 11 I am compelled to switch to UEFI
>> mode.
> 
> <snip>
> 
> Dell Precision M4800 laptops have 4th generation Intel Core processors
> [1] and Windows 11 does not support them [2].  So, even if you succeed
> in converting your Windows 10 / Debian 10 dual boot from BIOS/MBR to
> UEFI/GPT, you will not be able to run Windows 11 on that computer.
> 

You are right, my processor (i7-4810MQ) is currently in not supported 
processors list I finally found.

I run this tool https://github.com/rcmaehl/WhyNotWin11 on my laptop and 
it missed to point it out. It reported all requirements were met 
providing I will enable TMP module and switch to UEFI.

My bad, thank you for suggesting. 

Well, good for me... I no longer have this headache. :-) Considering MS 
will support Windows 10 up to Oct. 2025 I am doing just fine. I use 
Windows once a year to prepare my taxes anyway. By that time I'll have to 
replace my M4800 workstation with something more up to date in any case. 
With systemd advent it already started showing first signs of wanted to 
retire. I'm not even sure it will make it for 3-4 years more.

Thanks again.

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#236980

"Juan R. de Silva" <juan.r.d.silva@gmail.com> writes:

> Do you guys think it is actually feasible? Anybody can suggest something 
> easier, smarter? It's a lot of work to do... :-(

Why do you think this would be a problem? I intend to do this on my
desktop system at some point. I thought I'd just get a new SSD and make
that my boot drive and clone the partitions over but after a little
googling it seems the conversion isn't that difficult.

For example, these instructions cover the conversion of a Ubuntu +
Windows 10 dual boot system:
https://www.rojtberg.net/1032/converting-a-ubuntu-and-windows-dual-boot-installation-to-uefi/

My setup is a little more complicated since I have Debian and Arch in
addition to Windows 10 but I don't expect major issues. Definitely
taking an image of my boot SSD first though.

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#236986

On Tue, 06 Jul 2021 22:17:22 +0300, Anssi Saari wrote:

> "Juan R. de Silva" <juan.r.d.silva@gmail.com> writes:
> 
>> Do you guys think it is actually feasible? Anybody can suggest
>> something easier, smarter? It's a lot of work to do... :-(
> 
> Why do you think this would be a problem? I intend to do this on my
> desktop system at some point. I thought I'd just get a new SSD and make
> that my boot drive and clone the partitions over but after a little
> googling it seems the conversion isn't that difficult.
> 
> For example, these instructions cover the conversion of a Ubuntu +
> Windows 10 dual boot system:
> https://www.rojtberg.net/1032/converting-a-ubuntu-and-windows-dual-boot-
installation-to-uefi/
> 
> My setup is a little more complicated since I have Debian and Arch in
> addition to Windows 10 but I don't expect major issues. Definitely
> taking an image of my boot SSD first though.

There is a difference in suggested by your link approach and my 
requirements. I have reasons to avoid re-installation of my existing 
Windows 10. The suggested procedure based on fresh install of Windows 10 
from from the media created by Microsoft Media Creation tool instead. 
Thus I would have to convert the existing Win10 install. This is the part 
in which I was not sure. 

Actually now I think that it is feasible and even shouldn't be 
exceedingly difficult. But it would be a time consuming, should be 
carefully planned.

For the reasons I mentioned in my second post, I'm not sure any longer it 
is worth for me to get engaged in this (unless for the sake of 
experiment). As I said I can happily live with Windows 10 until the time 
comes to replace my laptop with a new one.

BTW, my setup is in no way simpler than yours. My system is multi-boot: 
Win10, Debian 10 (my primary OS), Ubuntu, and KDE Neon. I just omitted 
not relevant details in my original post. :-)

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#236987

"Juan R. de Silva" <juan.r.d.silva@gmail.com> writes:

> There is a difference in suggested by your link approach and my 
> requirements. I have reasons to avoid re-installation of my existing 
> Windows 10. The suggested procedure based on fresh install of Windows 10 
> from from the media created by Microsoft Media Creation tool instead. 

No. Where does it say that? As I said, I intend to convert my system
using those instructions. To me that does not mean reinstalling stuff. I
don't need instructions for that.

> For the reasons I mentioned in my second post, I'm not sure any longer it 
> is worth for me to get engaged in this (unless for the sake of 
> experiment). As I said I can happily live with Windows 10 until the time 
> comes to replace my laptop with a new one.

I meant to comment but then decided no to bother. Anyways, my view on
that is that blind belief in some instances claims about supporting
stuff can usually be taken with a very large grain of salt. For example,
I have here an oldish Dell Latitude. It's not supported by recent
versions of Windows 10 any more but that doesn't mean anything. Current
version of Windows 10 still runs fine on it.

> BTW, my setup is in no way simpler than yours. My system is multi-boot: 
> Win10, Debian 10 (my primary OS), Ubuntu, and KDE Neon. I just omitted 
> not relevant details in my original post. :-)

Good to know. My comment was only meant to show optimism in that it's
possible to adapt instructions found on the internet to different
circumstances.

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