Unetbootin is a tool which was created by Geza Kovacs that helps you to create a Live Linux USB flash from an ISO file.
It is compatible with Windows, Mac OS X and Linux. This tool offers you a great chance to explore Linux distributions without the need of burning CD media. It is very easy to use and very powerful tool. You can use ISO files you have downloaded or you can use UNetbootin to download the ISO file for you. UNetbootin uses Syslinux to make your USB drive bootable. It is written in C++ using the Qt4 toolkit and it is open-source.
How to use UNetbootin? After you have installed it, open a new terminal and run UNetbootin tool as root with “sudo unetbootin” command like shown in Figure 1.
Type your password and press Enter:
Click Diskimage and select the ISO file like shown in Figure 3.
Plug in the USB you want to use and click OK. Wait until the proccess is finished. Now reboot your computer and boot from the USB drive.