I have confirmed this due to added information, but could you try
sudo apt-get purge usb-creator
and then
sudo apt-get install usb-creator
In a terminal and then retry the creation. If this still fails, install UNetBootIn and try it from there to test your ISO
I have confirmed this due to added information, but could you try
sudo apt-get purge usb-creator
and then
sudo apt-get install usb-creator
In a terminal and then retry the creation.
If this still fails, install UNetBootIn and try it from there to test your ISO