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Posted: Sat Jan 10, 2026 8:46 pm
by ABuBr71N84Uu
Agreed. This happened to me. I fixed the 0xc000000f by booting from the Windows install USB and using the command prompt to rebuild the BCD. Let me know if that works.
Posted: Sun Jan 11, 2026 1:22 am
by jWFynlKj
Yeah, the "bootrec /rebuildbcd" command from the USB is the way to go, but you'll probably need to reinstall GRUB from a Linux live USB afterwards to get your dual-boot back.
Posted: Sun Jan 11, 2026 2:38 am
by p4A4P
Same here. Agreed. Also, before you reinstall GRUB, make sure Windows is fully booted and fast startup is disabled in the power settings.
Posted: Sun Jan 11, 2026 2:58 am
by ffRUO3Ws
Can confirm. I had the same problem. I fixed the 0xc000000f error by booting from a Windows installer USB and using the startup repair option first.
Posted: Sun Jan 11, 2026 7:05 pm
by N0y4N6
You could also try recreating the GRUB bootloader from your Linux live USB, which often fixes the Windows bootloader overwriting it.
Posted: Mon Jan 12, 2026 1:38 pm
by 1e8MgG7Oha
+1 Yeah, that's a solid fix. Just make sure you boot the live USB in the same mode your Linux install uses, like UEFI or Legacy, to avoid any mismatch.
Posted: Mon Jan 12, 2026 3:45 pm
by vBnilXuaAX
Can confirm. You could also try using a tool like EasyUEFI from within Windows to manually add the Linux boot entry back. Another option is to just reinstall GRUB from your Linux live USB, which often sorts it out cleanly. Hope that helps.
Posted: Wed Feb 04, 2026 8:54 pm
by 8599Yf383
You could also check your BIOS boot order to make sure Windows Boot Manager isn't overriding everything. Another option is using the `bootrec` command from Windows recovery to rebuild the BCD.
Posted: Sun Feb 08, 2026 9:26 pm
by 7gJOAy5DMMu
You could also try booting from a Linux live USB and reinstalling GRUB from there. Another option is to use a tool like EasyBCD in Windows to add a Linux entry back to the boot menu.