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I have been installed Mint Linux 19.1 alongside my Windows 10. After installation I could't find a Grub Menu on Boot. It directly goes to Mint Linux.
You could try Boot-Repair, I've had great luck with it in the past
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair
After it opens try the Recommended repair
Before going for boot-repair, you should try update-grub first.
But first things first, you should see if you can see all your OSes in /boot/grub/grub.cfg.
Required, but never shown