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

Java Jive <[email protected]>
Newsgroups alt.os.linux,uk.comp.os.linux,alt.comp.microsoft.windows,alt.comp.os.windows-11
Organization A noiseless patient Spider
Message-ID <[email protected]>
On 2025-11-15 13:51, Carlos E.R. wrote:
> On 2025-11-15 02:57, Java Jive wrote:
>> On 2025-11-11 13:19, Java Jive wrote:
>>>
>>> On 2025-11-11 03:45, Paul wrote:
>>>>
>>>> On Mon, 11/10/2025 7:27 PM, Java Jive wrote:
>>>>>
>>>>> Perhaps next I might try seeing if I can boot W11P from the 
>>>>> original MBR menu, which would achieve the desired state of only 
>>>>> needing one boot menu.
>>>
>>> Had a go at that meantime, couldn't get it to work.
>>
>> Still no success with this business of trying to boot Win11P on a GPT 
>> disk from Grub launched from an MBR disk.  This is what I've tried ...
> 
> Maybe using os-probe from the first disk, it would find the W11 and 
> create an stanza.

Running 'update-grub' produces two entries, one for each set of UEFI 
boot files in /dev/sdc{1,2}, and both entries are similar to the one 
already quoted, except that both insert a drivemap command and use 
chainloader +1, so both reboot the PC.

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