WinUSB gives a exit code: 256

Solution 1:

I started winusb from console:

gksudo winusbgui

then winusb detect my pendrive correctly, and I succesfully copied the Windows 7 installer to my pendrive (Ubuntu 14.10).

Solution 2:

For some reason winusb kept hanging up on formatting the USB drive, said it couldn't access the drive. I ended up formatting to NTFS using the "Disks" application in Ubuntu and then using winusb from the terminal:

sudo winusb -v --install Win_7_Pro.iso /dev/sdc

NOTE: you can check to see what your usb device is using lsblk from a terminal, mine was sdc.

Solution 3:

I faced the same error, and tried too many fixes until found the fix. Here is the fix in my case (I hope it works for you too):

1. open GParted app then unmount the USB stick.

2. open WinUSB or WoeUSB (a fork of WinUSB) and choose the .iso Windows file, and choose the USB stick. Everything goes right!

If you need to see the fix visually, I made a video on YouTube for the fix.