I want to install Windows 10 because I want to play some games and on Ubuntu is not that playable so I downloaded a iso file from Microsoft page and now I don't know how to install! I mounted the iso file and ran Setup.exe but it says
Windows installation cannot be started from the current operating system. To install Windows, boot from the installation media, or upgrade from a supported operating system and restart the installation.
Is there any other way to boot Windows 10 iso from Ubuntu?
You can
Burn a boot DVD disk. Make sure to 'burn an iso file'. (Do not create a data DVD with the iso file.)
Create a boot USB drive. You can use mkusb-nox or mkusb-dus alias mkusb version 12. See these links,
help.ubuntu.com/community/mkusb/v7#Making_a_USB_drive_to_install_Windows
If you want to install Windows without removing Ubuntu, you could download Virtual Box and you can run Windows inside Ubuntu, but the gaming performance may not be good as real metal.
