GRUB doesn't show Windows 10
Solution 1:
First I tried with sudo os-prober
and sudo update-grub
and it didn't recognize my windows.
Finally I solved this problem following steps of Boot-Repair
Install boot-repair
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair
Push "Recommended repair" And put in a terminal some commands as it suggested.
I think my Grub doesn't recognize windows due to a bad shutdown, and it solved the problem.
I hope this help you.