How do I install WinUSB on 14.10 [duplicate]

Try the following commands based on How can I create a Windows bootable USB stick using Ubuntu?

Since you are running the Ubuntu 14.10 (Utopic) You need to replace trusty with utopic in the commands listed. The commands should look like this.

sudo add-apt-repository ppa:colingille/freshlight
sudo sh -c "sed -i 's/utopic/saucy/g' /etc/apt/sources.list.d/colingille-freshlight-utopic.list"
sudo apt-get update
sudo apt-get install winusb

You can start with the second line as you have already added the repository. The PPA is not updated beyond Saucy. Without the second line sudo apt-get update fails as there is no version specific to Trusty or Utopic. This code tells update to use the Saucy version of winusb from the PPA in the Ubuntu 14.10 (also known as Utopic) .

Hope this helps