Recover Ubuntu boot loader with Boot repair tool

Execute below command to recover ubuntu boot partition:

curl -s https://raw.githubusercontent.com/kribakarans/bootrepair/master/bootrepair.sh | bash

Install Grub to install Grub

sudo grub-install

Re-order boot menu entry

efibootmgr # For Linux
    Example: sudo efibootmgr -o 0,1,2,3

bcdedit    # For Windows

Weblinks:

https://github.com/kribakarans/bootrepair.git https://www.youtube.com/watch?v=WVqnfNheRj8 https://askubuntu.com/questions/485261/change-boot-order-using-efibootmgr