UNetbootin automates this task by providing a GUI to create a bootable Ubuntu Live USB drive from an ISO file, and can be run from both an installed Windows or Linux system, or from a liveCD. Current Ubuntu versions can also be cloned directly from the iso file to a USB drive. Most users should use Startup Disk Creator or Unetbootin instead of many alternatives described here that perform similar steps. Ubuntu distributions from 8.04 'Hardy' onwards have 'Startup Disk Creator' a usb-creator tool that creates a bootable USB flash drive from a Ubuntu CD or iso image. Technical details and custom USB Installation Media
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