Step1: Install GRUB updater
sudo apt install grub-updater
Step2: Modify grub configuration to be able to detect Windows
sudo joe /etc/default/grub
…and add the following line
GRUB_DISABLE_OS_PROBER=false
Step3: Update the GRUB entries
sudo grub-updater
Step4: Restart
…
Example of the Windows GRUB entry:
insmod part_gpt
insmod fat
search –no-floppy –fs-uuid –set=root 08C8-81C2
chainloader /EFI/Microsoft/Boot/bootmgfw.efi
(uuid you can get for example from “ls”)