UNetbootin is an opensource cross platform application that provides you functions to easily create bootable Live USB drives for Android, Ubuntu, Fedora and other Linux distributions without any burning a CD. The application is compatible with Linux, Windows and Mac OS X. Also you can either let UNetbootin download one of the many distributions supported out-of-the-box for you, or you can supply your own Linux .iso file if you’ve already downloaded one or your preferred distribution isn’t on the list. For installing UNetbootin in Ubuntu you have to give a few simple commands from terminal.
Give following given commands one by one from your Ubuntu Terminal:
sudo add-apt-repository ppa:gezakovacs/ppa
sudo apt-get update
sudo apt-get install unetbootin
Where the first command is for adding repository which is necessary for updates and support for older versions.
After the installation completes:
Open Dash Home present in Ubuntu Launcher and start typing UNetbootin then click its icon to open it. The applications asks for admin password and then you will be able to use it. For any more information refer to this link.