This was VERY irritating to figure out. So here are the steps to create an installation usb for Windows manually.
- Download the installation iso from Windows (https://www.microsoft.com/en-us/software-download/windows10ISO)
- Prepare the usb drive
- sudo gparted (or cfdisk, whatever)
- Create partition table of
GPT
- Create 2 partitions
- fat32 partition of 1024MB with label BOOT (mark it bootable)