boot problem with linux and windows

Question

is their solve to my problem i was used kali and ubuntu and windows 8 but when am install new windows boot menu disappeared and my laptop log into windows automatically all time

Answer 1

Boot into a live session, then execute sudo fdisk -l. I'm assuming that you will be shown that your internal hdd is /dev/sda. Otherwise replace /dev/sda with whatever your hdd is called.

Then execute these commands:

sudo grub-install /dev/sda
sudo update-grub