You can all set Windows after Linux is installed and use two LOs. This requires two USB-Flash zero or one USB-Flash and the second PC to record the required loader.Download from the USB-Flash for Linux. Now watch carefully. When Linux got up from the flash drive and there's an Internet, i.e. Wi-Fi or LAN works, then it's okay. Otherwise, you'll be loaded with HDD OS and roll. https://sourceforge.net/projects/boot-repair-cd/files/ And you can boldly record it as a loader on USB-Flash with Linux. Also as long as you've got a D.O., I suggest you download all the driveways for your Windows distributor.Let's get off the Linux drive or the Boot repair program GParted. At the beginning of the disk, we'll give free space for Windows. I'll do it first! Because if you separate the disk from the end, the system still stands at 1 Gb at the beginning, and it'll all be the same by the time. It'll be a long time to separate, depending on the load of the disc, i.e. it'll carry the whole infus.We'll get off the Windows flash drive and set it free. I didn't share it on and D, because I need Windows just for toys.Attention has been drawn to the fact that the PC is only loaded in Windows. Don't panic. Downloaded from Linux or Boot repair. If the Linux flash drive and the Internet works, there's a Boot repair.sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update && sudo apt-get install -y boot-repair
Starts the set Boot repair and after the analysis in the emerging window, select the Recommended repair. If the Boot repair flash drive, the GRUB recovery has already begun.
Now, when the PC is launched, there's gonna beOS selection for eight seconds. Ubuntu will be default. If you need to change the loader configuration, it's a different story.