[Solved] Window 10 not showing in grub menu

Issues & Assistance
1

So installed cachy os and used grub and it isnt showing window 10 in grub menu

It only shows basic 3 options

its detecting window boot manager when running sudo os-prober but not showing on grub

2

So i found the solution

I simply added window 10 to grub menu

Find BIOS Boot Partition:

  • Open a terminal and run: sudo fdisk -l
  • Identify the partition containing the BIOS boot sector (usually /dev/sda1 but may vary).
  1. Find Windows Boot Manager Disk.
  2. Get UUID of BIOS Boot Partition:
  • Run: sudo blkid /dev/sda1 (replace /dev/sda1 with the actual partition).
  • Copy the UUID.
  1. Edit GRUB Configuration:
  • Open the GRUB configuration file: sudo nano /etc/grub.d/40_custom
  • Paste the following entry, replacing UUID_HERE with the copied UUID:

menuentry “Windows” --class windows --class os {
search --fs-uuid --no-floppy --set=root UUID_HERE
chainloader (${root})/EFI/Microsoft/Boot/bootmgfw.efi
}

  1. Save and Update GRUB:
  • Save the configuration file
  • Update GRUB: sudo grub-mkconfig -o /boot/grub/grub.cfg
    Note:
  • If your Windows boot manager is on a different partition or disk, adjust the chainloader path accordingly.