Trouble dual booting openSUSE Tumbleweed with Windows 11

English Install/Boot/Login
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Hello all,

I have attempted several times to no avail to dual-boot Windows 11 with openSUSE, following various tutorials.
First, I tried starting with Windows. I installed Windows onto my device and unallocated some space on my drive to install openSUSE.
I have tried two different ways, per different tutorials: creating a separate boot partition for openSUSE and trying to share the Windows boot partition. Neither worked; both resulted in installation completion leading to immediate booting into windows. When restarting and entering the boot menu, GRUB is inaccessible (it appears in the boot menu, but clicking it just causes the screen to reset).
I attempted to boot into rescue mode from the USB and mount the drives, chroot, and update GRUB, but then GRUB does not exist.
I am not sure if this detail is relevant, but I am using balenaEtcher to create my openSUSE bootable USB and Windows’ official media creation tool to create the Win11 USB. When I check the boot loader settings in openSUSE, it is using grub2 with BLS instead of EFI, if that matters.

Please let me know if anything here sounds astoundingly wrong or more information is needed. I have scrounged around forum posts about dual booting and nothing seems to quite line up with what I’m experiencing. Thank you!

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With that (new default) setting Tumbleweed should appear in the EFI firmware (aka “BIOS”) boot list. Accessing that EFI menu depends on your system firmware, e.g. repeatedly hitting “ESC” during power up, hitting F2, or F9 depending on vendor etc.

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Perhaps not relevant to the OP issue, but IINM I remember reading that grub-BLS requires a much larger boot partition (in the other of gigabytes) than grub-EFI. The few windows 10 installs I have here, installed on separate drives, have someyhing like 100 MB partitions.

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How many drives and what’s the layout?
Let get the info on my layout and I’ll post it.

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Couldn’t get the text format pretty so here’s a screenshot
I assume secure boot is already off.

drive layout_Screenshot_20260118_095927
drive layout_Screenshot_20260118_0959271062Ă—412 59.4 KB

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grub2-bls cannot do multi-boot. You need grub2-efi for that. No idea what that /new_home partition is intended for, it is only 500 MiB … The one labeled “Linux Home” is not mounted at all. And also no idea what “Linux” is supposed to be.