So you think I just need to go back to legacy boot and it will work? I will try that. Thanks.
Manjaro can only be installed without SB being enabled even if it is theoretically possible to re-enable SB, later on but this would be an expert task.
If you want to get only /dev/sdb1 to be booted and it’s not directly working when switching to legacy, then you should Manjaro-chroot into /dev/sdb1 via live ISO boot, being booted in BIOS mode, this is important.
Then, you could apply within chroot environment what is described here for BIOS boot:
Just confirming, I need the live USB and I can’t just do it from the kernel 6.6 boot?
Yes. Make sure legacy boot is enabled in your firmware. Make sure to really boot the USB stick in BIOS mode from your firmware. Usually, you see two entries, one with UEFI and one without. Don’t take the UEFI entry.
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Informational:
Manjaro does not support Secure Boot. While it is technically feasible to roll your own, Secure Boot is not supported by default on Manjaro.
When multibooting this mandates that you should also disable Secure Boot in Windows to allow a smooth multiboot scenario.
Additionally, two Operating Systems one booting as MSDOS/MBR and the other as and UEFI/GPT cannot peacefully coexist in a multiboot scenario. Both must boot using the same method.
To further complicate this, the Installer media of each OS must also boot using the same method, otherwise problems will arise.
So, you need to reconsider your strategy and reinstall one or both operating systems; presumedly as UEFI/GPT boot.
I suggest physically disconnecting one disk before you begin; and likewise, when you focus on preparing the other disk.
Regards.
They can, but it means to switch via firmware. If Windoof is only rarely used, this might be acceptable.
Understood. That said, I have never used the Windows 10 partition and don’t really care about it too much, except it would be nice to be able to boot it if I really needed windows 10 for some reason. I’m totally fine with changing the bios settings on that occasion. I don’t have the install media for windows 10 since it came with the system so cannot reinstall it.
In that case, perhaps disconnect it for the time being, focus on getting Manjaro the way you want it, then revisit Windows later (this time disconnecting Manjaro temporarily). This is likely what I might do.
Anecdotal:
I recall years ago (Win 7 era) one could have one MSDOS/MBR OS and one UEFI/GPT OS, and you had to boot into Windows and select the other bootloader in a menu.
This would force a reboot, but ultimately boot the other OS. It was extremely cumbersome, to say the least.
However, you can download the MediaCreationTool from Microsoft, and use that to download an official Windows 10 ISO.
Then boot that ISO and repair the Windows installation if needed (but do this only after disconnecting Manjaro).
Cheers.
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LOL, sounds partially similar to what I did so many years ago and in the end, I lost my Windows partition and did a clean installation of Linux on this laptop. Since then, Windows never put a foot on this computer… This wasn’t my intention, and I intended to bring it back… but never had.
As a newbie, breaking your system at least 2 times (or more) is a norm, we’ve all been there. Don’t worry, eventually you get it right, if you persist.
The weakest link (and the biggest problem) in any Linux system is always the user ;).
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