If a person has dual booted system and at grub menu, any one of is not showing then this is problem. Like, you have installed Kali and Window is not showing on the grub menu. Here are the steps to get out of this.
Steps to follow:
- Open the terminal in your operating system.
- Make sure, internet connection is there.
- Write the command, “os-prober”.
- Next write the command. “update-grub”.
- Wait for sometimes and restart your system.