XPost: uk.comp.os.linux, alt.comp.microsoft.windows, alt.comp.os.windows-11   
   From: java@evij.com.invalid   
      
   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 ...   
      
   menuentry 'Windows 11 Professional (on /dev/sdc2)' --class windows   
   --class os $menuentry_id_option 'osprober-chain-65153A0C0A7F9BDA' {   
   	savedefault   
   	insmod part_gpt   
   	insmod ntfs   
   	set root='hd2,gpt2'   
   	if [ x$feature_platform_search_hint = xy ]; then   
   	  search --no-floppy --fs-uuid --set=root --hint-bios=hd2,gpt2   
   --hint-efi=hd2,gpt2 --hint-baremetal=ahci2,gpt2 65153A0C0A7F9BDA   
   	else   
   	  search --no-floppy --fs-uuid --set=root 65153A0C0A7F9BDA   
   	fi   
   	chainloader /BOOTMGR   
   }   
      
   The above is what seems to get slightly furthest, but it fails with ...   
      
            error: invalid signature   
            Press any key to continue...   
      
   I've also tried both of the following ...   
      
            chainloader +1   
            chainloader /BOOTSECT.BIN   
      
   ... where /BOOTSECT.BIN is a dd dump of the first sector of the Win11P   
   partition, but both simply end up with the PC rebooting.   
      
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