So I just installed Winusb using the instructions from How can I create a Windows bootable USB stick using Ubuntu? but when I use the application I cannot select a target device. I have a usb that I want to select, but whenever I click the box under "Target device:" nothing happens. The .iso / source selection is fine; the only problem is the target device selection.
For anyone having trouble with this, I found a simple solution which works if you are sure that the USB stick is properly formatted to NTFS and is mounted.
Start by finding the name of the mounted disk by running
sudo fdisk -l. Once you find it (it'll be something like
/dev/sdc1), run the command based winusb command:
sudo winusb --install <iso path> <partition>
And with that, it should work.