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Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop

From	"Carlos E.R." <robin_listas@es.invalid>
Newsgroups	alt.os.linux, uk.comp.os.linux, alt.comp.microsoft.windows, alt.comp.os.windows-11
Subject	Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop
Date	2025-10-31 14:26 +0100
Message-ID	<b1qetlxmnh.ln2@Telcontar.valinor> (permalink)
References	<10e2bmf$g287$1@dont-email.me>

Cross-posted to 4 groups.

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On 2025-10-31 13:56, Java Jive wrote:
> As per subject, as I now have on the same PC some OSs  -  Ubuntu24, 
> Windows7/10  -  installed on an MBR disk and Windows 11 installed on a 
> GPT/UEFI disk, I'd like if possible to find a way of booting any of 
> them, and MBR/GPT USB sticks, without constantly having to change the 
> BIOS settings on the PC.
> 
> Research into whether this is possible seems to produce mixed results, 
> mostly not, but a few suggesting it's possible, but I haven't yet found 
> anything with clear and understandable instructions on how to achieve it.
> 
> My own gut feeling is that it should be possible, but, while I have a 
> good understanding of how a PC boots an MBR disk, I have less 
> understanding how one boots a GPT/UEFI disk.
> 
> Has anyone here been able to achieve this?  Does anyone know of good 
> reliable sources of information about this?

I think it might work if the system is UEFI with GPT disks, if you put 
the other system in a partition, with boot code in the start record of 
that partition. You would then need "something" in /boot/EFI to load 
that boot code in that partition.

-- 
Cheers, Carlos.
ES🇪🇸, EU🇪🇺;

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Thread

Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2025-10-31 12:56 +0000
  Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop "Carlos E.R." <robin_listas@es.invalid> - 2025-10-31 14:26 +0100
  Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Windows Elf <windows.elf@outlook.com.invalid> - 2025-10-31 14:57 +0000
  Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Paul <nospam@needed.invalid> - 2025-10-31 12:04 -0400
  Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Theo <theom+news@chiark.greenend.org.uk> - 2025-10-31 16:06 +0000
  Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2025-11-02 14:12 +0000
  Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2025-11-11 00:27 +0000
    Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Paul <nospam@needed.invalid> - 2025-11-10 22:45 -0500
      Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2025-11-11 13:19 +0000
        Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Paul <nospam@needed.invalid> - 2025-11-11 10:13 -0500
          Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop "Carlos E.R." <robin_listas@es.invalid> - 2025-11-14 13:24 +0100
            Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Paul <nospam@needed.invalid> - 2025-11-14 13:03 -0500
              Re: scanners. "Carlos E.R." <robin_listas@es.invalid> - 2025-11-14 20:31 +0100
                Re: scanners. Paul <nospam@needed.invalid> - 2025-11-14 17:52 -0500
                Re: scanners. "Carlos E.R." <robin_listas@es.invalid> - 2025-11-15 04:06 +0100
        Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2025-11-15 01:57 +0000
          Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop "Carlos E.R." <robin_listas@es.invalid> - 2025-11-15 14:51 +0100
            Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2025-11-15 15:01 +0000
              Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Paul <nospam@needed.invalid> - 2025-11-15 11:54 -0500
        Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2026-02-20 17:44 +0000
          Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Paul <nospam@needed.invalid> - 2026-02-20 13:46 -0500
            Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2026-02-20 20:01 +0000
              Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2026-02-20 23:29 +0000
    Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop TJ <TJ@noneofyour.business> - 2025-11-16 13:58 -0500
    Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Java Jive <java@evij.com.invalid> - 2025-12-16 17:04 +0000
      Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop "Carlos E.R." <robin_listas@es.invalid> - 2025-12-16 21:27 +0100
  Re: Is it possible to dual-boot both MBR & GPT without changing BIOS settings on laptop Adrian Caspersz <email@here.invalid> - 2025-11-22 18:22 +0000

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