this post was submitted on 04 Jun 2025
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    windows update (lemm.ee)
    submitted 2 days ago by [email protected] to c/[email protected]
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    [–] [email protected] 8 points 1 day ago (3 children)

    When installing windows while there is a Linux install, windows will see the EFI partition already there and just decides to share it, and doesn’t create its own.

    That's what it's supposed to do, it's a plain FAT32 partition, the bootloaders are just files you put in there.

    Part of the issue is that while a well-made motherboard will look for all bootloaders on the partition and present them as options in the firmware UI, bad ones will only look for a specific file (\EFI\BOOT\BOOTX64.EFI) and use that. For an OS to have a chance of booting on those boards it has to overwrite that file, blowing away whatever other bootloader was there before.

    It's annoying, since Windows is mostly well behaved here (It puts the main copy of the bootloader at \EFI\Microsoft\Boot\bootmgfw.efi and Linux bootloaders can see that and offer it, the reverse isn't true) and can co-exist with Linux well (Well...), but manufacturers cutting corners causes more problems for everybody.

    [–] [email protected] 2 points 1 day ago

    The \EFI\BOOT\BOOTX64.EFI is the only file the UEFI standard says it is required automatically lookup from an EFI system partition. There can many EFI partitions but the UEFI is only required to find a single file per such a partition.

    efibootmgr -u can show all bios auto created boot entries (don't touch those, the bios can/will reset them at whim) and the manually created entries that don't launch a BOOTX64.EFI named file.

    [–] [email protected] 4 points 1 day ago (1 children)

    Wow, damn. I didn't know the motherboard can have a hand in this. Stupid gigabyte then. I hope this time, windows stays in its lane if I ever had to reinstall Linux. Thank you for the explanation, btw. Much appreciated

    [–] [email protected] 2 points 1 day ago (1 children)

    I'd double check, if you haven't picked an option specifically it might just default to the fallback (i.e. BOOTX64) It'll be under the boot device order section.

    (Not my picture, stole it from Reddit)

    Here it's listing all the possible boot options this mobo can find, but there's a generic "UEFI OS" option which I'd bet is the fallback. And once a choice is made it's kept unless something resets it, so if it just happened to be set to the fallback once it'll stick with that until a change is forced.

    [–] [email protected] 2 points 1 day ago

    There WAS something weird that had a UEFI word in it, but choosing it shows nothing. I'd go over all the menu choices I see one by one and none of them takes me to windows. It was very annoying, all good now since I separated them. Next time this happens I'll just ask on the Linux community. Hopefully you'll pop up there and help. πŸ˜…

    [–] [email protected] 3 points 1 day ago

    Ahhh, so that's why I've never had any issues with my linux first windows 10 second setup.