Windows Upgrade Help and more

I'm trying to upgrade my Windows 10 PC to Windows 11, but I have a dual-boot setup with Linux. After the upgrade, my GRUB bootloader is gone and it just boots straight into Windows. I've tried using `bcdedit` and EasyBCD, but I keep getting an error code 0xc000000f. How can I get my dual-boot menu back without breaking the new Windows 11 install?

+1 Gotcha, so did you try booting from a Linux live USB to reinstall GRUB yet?

Not 100% sure, but The Windows 11 installer likely overwrote the bootloader. You'll need to boot from a Linux live USB and reinstall GRUB to the main drive's MBR or EFI partition. Let me know if that works.

You could also try using the `boot-repair` tool from the live USB, it often automates fixing GRUB. Another option is to check if your EFI partition still has the Linux files and just needs the boot order adjusted.

Yeah, You could also manually reinstall GRUB from your Linux live USB using the terminal. Another option is to check if Windows Fast Startup is interfering and turn it off.

+1 Before you try that, can you confirm if your Linux partition is still showing up in Windows Disk Management?

Agreed. You could also try using a tool like Boot-Repair from your Linux live session. Another option is to make sure your Linux partition is still intact and then update GRUB.

You could also check if your BIOS is still set to boot from the drive with GRUB installed. Another option is to manually reinstall GRUB from your Linux live USB.

Yeah, that's solid advice. One extra tip: make sure Secure Boot is disabled in your BIOS before reinstalling GRUB, as it can sometimes interfere. Let me know if that works.

Agreed. Also, if you're using a live USB, try the "Boot Repair" tool—it's often quicker than doing it manually.