I used to run dual booting Ubuntu with Windows 10 with no conflicts at all for over a year now. The Grub Boot-loader was Ubuntu's.
I decided to install Kali Linux to fulfill triple booting for educational purposes. The issue is the default Grub loader now is Kali's and it's only showing Ubuntu & Kali Linux.
After trying Gparted and disk listing I realized that windows 10 is still there safely.
I remember choosing to install Kali Linux's grub boot-loader at the installation which said that it detected Ubuntu & Windows 7. Then it over-wrote Ubuntu's grub and windows isn't accessible anymore.
I am new to Kali but I know one thing. I would probably get windows 10 Back if I can install Ubuntu's boot-loader back as the default grub. Any idea how to perform this? Or what would the best solution be with regard to this case?
I also had UEFI as the default boot method from the BIOS but switching it with Legacy back and forth makes no difference.
Best Answer
I would recommend you to run a live cd of Ubuntu and install boot-repair. Open the terminal and copy and paste the following command:
After successfully adding and updating the repository type the following command:
There you can solve your issues related to boot.
Or try it with Super GRUB 2 disk.
You can download it from here.
Then install it in a usb using Unetbootin Now you could restart your system and make sure it is set in the boot option menu.