Screenshot: https://i.stack.imgur.com/SorKT.png
So I tried to install Ubuntu 18.04 alongside with my Windows 10 Installation recently, but it doesn't show the way to install alongside with Windows 10, it just not there, only erasing Windows 10 and install Ubuntu on.
My latop is fairly old by now (Core2 Duo and doesn't have UEFI), and I just want to install Ubuntu as a lighter and faster alternative to Windows, which is a bit slow recently
btw i already install ubuntu in the past, there still the options to dual boot, when i change my hard drive and install Windows 10, it's gone