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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.