I am trying to make a Live USB of ubuntu 12.04 desktop. I did download it from the site. It shows that its a iso file. I am trying to browse it from multiboot installer(YUMI) but I don't know why Multiboot Installer is unable to detect it as it is a iso file. I tried renaming the file .iso. but nothing worked for me. Please help me I am stuck and frustrated. Trying to get things straight for hours.