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Why do I lose my Linux entries from UEFI boot? (lemmy.world)

submitted 8 months ago by [email protected] to c/[email protected]

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I dual boot Windows 10 and Linux. Whnever Windows freezes or boot gets interrupted etc. I lose access to Linux because UEFI offers only Windows as boot options. On checking EFI partition still has rEFInd and PCLinuxOS entries needed.

I wonder why it cannot see them?

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[–] [email protected] 11 points 8 months ago (6 children)

It is because of Secure Boot. Windows is doing exactly what it is supposed to do. The UEFI Secure Boot keys are not part of Linux.

Your bootloader is the biggest attack surface on most modern computers. You can foolishly turn off secure boot, but windows may require SB to work at all. I think W10 may have had an option to turn off the SB requirement, but I know W11 must have SB.

You can manually sign your own keys and replace them. I'm not going to just explain it all rn, but you can ask if you really need the help.

If you want the easy path, just run any Fedora or vanilla Ubuntu. They both have a special key that is signed by m$ called a shim. It can coexist with Windows easily without any problems. I have a w11 partition just for adjusting my RGB keyboard sitting beside Fedora all the time on the same drive.

Secure boot is designed to delete all unsigned bootable code. If you run a signed OS with SB this will always happen regardless of what other software is present. Self signed Linux would delete unsigned Windows just the same.

[–] [email protected] 6 points 8 months ago (3 children)

A w11 partition to adjust your RGB is peak fucking Linux haha

Sidenote: is it not possible to run a vm for that?

[–] kugmo 3 points 8 months ago

I used a VM to adjust my Logitech Mouse LEDs, so yeah passing it through should be possible and assuming it saves the settings to the devices onboard firmware instead of the Windows software doing the configurations at launch.

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