Cant install WinUSB [duplicate]

What you are trying to do will not work ... you try to install an Ubuntu Saucy package on Xenial. Instead you can use the built-in gnome-disk-utility to create the Windows installation media.

Open Disks and select Restore Disk Image from the menu on the top right of the application.
Choose the Windows installation file and the USB drive to write it to, then click Start Restoring.

Winusb doesn't work in 16.04 (xenial) because there is no ppa for xenial (yet). You can find newer winusb versions here: http://ppa.launchpad.net/colingille/freshlight/ubuntu/pool/main/w/winusb/ , but I doubt any of them will work in xenial.