There are many guides how to create a bootable windows USB on Ubuntu, but most of the solutions are no more working or too complicated. I was able to find an easy solution how to write an Windows installation .iso file to a bootable USB. Here are the steps I followed:
1.Open terminal (CTRL + Alt + T), then write and execute the following commands:
sudo apt install git p7zip-full python3-pip python3-wxgtk4.0
and then
sudo pip3 install WoeUSB-ng
2. Open find and start typing ‘WoeUsb’, then open the app:
3. Open the app, select the windows iso file, USB path (screenshot above) and proceed.