Today, I needed to create Windows 10 USB key in order to install it in the laptop. I found it not so straightforward under Ubuntu… But quickly I found a simple solution, WinUSB.

# install WinUSB
sudo add-apt-repository ppa:nilarimogard/webupd8 && sudo apt update && sudo apt install winusb

# without USB formatting
sudo winusb --install Win10.iso /dev/sdd

# with USB formatting - this didn't work for me, due to boot loaded installation fauilure
sudo winusb --format Win10.iso /dev/sdd

Source: webupd8.