Installing Ubuntu 16.04 alongside Windows 10 on Dell Inspiron 11 - 3162 ...... Not detecting Windows while installing

Just bought and Inspiron 11 3162 with 2GB Ram and 500 GB hard disk. Went through the process of making a bootable USB with Ubuntu 16.04 using Win32 Disk Imager. After disabling disabling Fast boot and Secure Boot was able to run Ubuntu off the USB. However when I wished to install on the Hard Disk (Had already kept 100 GB unallocated space by shrinking Windows), the option to install Ubuntu alongside Windows 10 does not appear.

Went through all the steps from the link www.everydaylinuxuser.com/2015/11/how-to-install-ubuntu-linux-alongside.html?m=1, but those instructions do not address this particular problem.

Any help here

Bani