A bootable Ubuntu USB is very useful for multiple reasons. If you are a Windows user and thinking to migrate to Linux, you can experience Ubuntu desktop/Linux desktops without hampering your PC configuration or installation using a Live USB stick. Also using this, you can boot from the USB stick directly from an Internet Cafe or any borrowed computer. Not only that, if you have a broken system you can always use the USB stick to boot from and repair the broken system/recover data. Here are the steps to follow to create a bootable Ubuntu USB from Microsoft Windows.