Fix-grub-not-showing-windows:

*This is to fix an issue starting in Ubuntu 22.04 where grub's os-prober is ignored, even if it finds a boot entry.
*With UEFI firmware, the needed Microsoft files are within the EFI Partition (partition 1 Fat32).
It does not matter what file system windows is actually installed on (NTFS or ReFS) for Grub to find windows.

Edit the "/etc/default/grub" file and add this line:
GRUB_DISABLE_OS_PROBER=false

Save the file and then run:
sudo update-grub

There should now have an grub menu with the option to boot Windows and Grub.

Sources: Ask Ubuntu, OMG Ubuntu!
Date: October 11th 2024

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