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I have a PC with a mechanical interrupt in order to enable different hdds and use different OS. Windows has bee installed with bios legacy.

I want to install in the other HDD archlinux. When I try to disable secure boot, the enter is greyed out. I followed the instruction and I set the admin password, still greyed out. I have an ASUS b150m-c motherboard.

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  • I would suggest that you post your answer as a solution rather than editing the question. Commented Dec 29, 2022 at 12:05
  • I rolled back your recent edit tagging the title with "CLOSED". If one of the answers solves your issue, consider accepting it. If you have a solution different from all answers, consider adding that solution as a separate answer and accept it later. Accepting an answer will mark the question as resolved. Please see unix.stackexchange.com/help/someone-answers and unix.stackexchange.com/help/self-answer Commented Dec 29, 2022 at 12:19

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Since you are using legacy BIOS boot, it probably means Secure Boot is either already disabled or overridden by the selection of a legacy BIOS boot method.

Secure Boot is UEFI-only technology: it cannot be applied to operating systems that are using legacy BIOS boot.

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  • ok,, can I install arch-linux "UEFI-version" on the other HDD? because I have installed it but does not work (does not boot, start the uefi instead), I thought it was for secure boot option but I not sure anymore Commented Dec 11, 2022 at 16:37
  • It depends on your BIOS settings: if configured for "legacy boot only", then an UEFI version of Arch won't work without changing the settings. Also, an UEFI bootloader usually cannot start an OS that uses the legacy BIOS boot method, and a legacy BIOS bootloader definitely cannot start an OS that uses UEFI, so if you want a boot menu of OSs, you'll need to use the same boot method for all of them. But if you use a mechanical switch to select your system disk, then that's not a problem for you. Commented Dec 11, 2022 at 16:52
  • Unfortunately Asus's manuals for your motherboard won't show all the BIOS settings on the "Boot menu" page, so I cannot give you exact suggestions. Any sub-menus of, and any menu items after the "CSM (Compatibility Support Module)" would be important here. Commented Dec 11, 2022 at 16:57
  • ok * Launch CSM - enabled * boot device control - UEFI and legacy OPROM * boot from network device - Ignore * boot from Storage Device - Legacy only ( possibilities Ignore, Legacy only, UEFI driver first) * boot from PCI-E/PCI Expansion Devices - Legacy only ( possibilities Ignore, Legacy only, UEFI driver first). ** I thought "boot from Storage Device - UEFI driver first) could be the right setting but I was afraid to mess up windows boot Commented Dec 11, 2022 at 19:52
  • You are entirely correct: "boot from storage device - UEFI driver first" means that the system first looks for UEFI-bootable disks, and if none of those are available, then legacy BIOS-bootable disks. That would allow you to use both UEFI- and BIOS-bootable disks, as long as only one type of bootable disk is visible to the system at any time. As I understand, it would suit your purposes, and should not harm your Windows boot at all. And it is simple to change back if necessary. Commented Dec 11, 2022 at 20:44
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UPDATE Now works,I think it was a combination of bad fstab and "boot from Storage Device - UEFI driver first" not set in the UEFI/BIOS settings

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