Ubuntu and windows 10 both work together
 

I formatted it but I can not run it at the same time

Hi volkan, and welcome to LQ.

Can you please explain what you've done? Did you install Ubuntu (which version?) as a dual boot alongside Windows 10?

If so, what is it exactly that's not working?

With a dual boot, you either boot into one operating system or the other, you cannot run both at the same time.

If you want to run the two operating systems at the same time on the same machine, you should look at running either Ubuntu or Windows 10 in a virtual machine instead, hosted by the other operating system.

Hi volkan and welcome to LQ,

As hydrurga states, you need to provide a great deal of additional information about what you've done, what status this system is present at, the specifications of your computer.

If you need some guidance on how best to ask questions in LQ, please see our Site FAQ, and then consider updating this thread with additional information.