Once you click ok, UNetbootin will download the necessary files and install them on your USB.Now, choose the type as USB and select your USB drive from below and click OK.Select both the distribution and the version.To install a distribution using the same method. Selecting the distribution will automatically download the necessary files for the specific distribution from the internet. There are two options to make a bootable USB – using the Distribution dropdown menu or selecting a disk image.Plug in the USB drive and Unetbootin will automatically recognize it.Now, UNetbootin will be installed and the bootable USB creator application will appear in your applications list.