UNetbootin allows you to create bootable Live USB drives for a variety of Linux distributions from Windows or Linux, without requiring you to burn a CD. You can either let it download one of the many distributions supported out-of-the-box for you, or supply your own Linux .iso file if you’ve already downloaded one or your preferred distribution isn’t on the list.

UNetbootin can create a bootable Live USB drive, or it can make a “frugal install” on your local hard disk if you don’t have a USB drive. It can load distributions by automatically downloading their ISO (CD image) files, or by using existing ISO files, floppy/hard disk images, or kernel/initrd files, for installing other distributions.

Install UNetbootin in ubuntu

Option1:For Ubuntu 9.10 and higher,just run following three commands in Applications->Accessories->Terminal to install UNetbootin from PPA:

sudo add-apt-repository ppa:gezakovacs/ppa
sudo apt-get update
sudo apt-get install unetbootin

Option2: First,edit /etc/apt/source.list by this command:

sudo gedit /etc/apt/sources.list

Add one of following lines to the file,then save and close.

For ubuntu 10.04:

deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu lucid main 
deb-src http://ppa.launchpad.net/gezakovacs/ppa/ubuntu lucid main 

For ubuntu 9.04:

deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu jaunty main
deb-src http://ppa.launchpad.net/gezakovacs/ppa/ubuntu jaunty main

For ubuntu 9.10(karmic):

deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu karmic main
deb-src http://ppa.launchpad.net/gezakovacs/ppa/ubuntu karmic main

For ubuntu 8.10:

deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu intrepid main
deb-src http://ppa.launchpad.net/gezakovacs/ppa/ubuntu intrepid main

For ubuntu 8.04:

deb http://ppa.launchpad.net/gezakovacs/ppa/ubuntu hardy main
deb-src http://ppa.launchpad.net/gezakovacs/ppa/ubuntu hardy main

Now,add the GPG key:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 72D340A3

Update and install UNetbootin:

sudo apt-get update

sudo apt-get install unetbootin

Go to Applications->System Tools->UNetbootin