GYGB

Get Your Grub Back - Get it back from the clutches of Windows on EFI systems

Tired that after you booted to windows it removed your grub ? Then you are at the right place just boot from any live distro and enter the following commands :

wget https://github.com/N3V0N/GYGB/releases/download/1.0/GYGB.sh

then

bash GYGB.sh