To boot Ubuntu Linux from .img file

I have installed Ubuntu Linux on an .img file which contains gpt partition table with just single partition.
I have not created boot partition but it just has root partition which is having ext4 files stem.
I want to boot it in a physical machine not in virtual machine using that image.
Windows is already installed in my laptop.
The img file is located in sda5 by the name aa.img
Please explain how to do easily and mainly I am a new user to Linux
Thanking I advance