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Whatever the operating system you use, the methods is same. I will show you an example of how to use Unetbootin to create a live USB of current version of Ubuntu (17.10). In order to be successfully create a live USB, be sure your USB drive is available in a FAT32 format. You can use Unetbootin to create a live USB of nearly all Linux distros. The tool doesn’t use distribution-specific rules to make your live USB drive. However, I suggest you to use your own ISO file instead of using that features since the downloaded Linux version is not the newest one. This features allows you to create a live USB even if you have no ISO file on your computer. It has a built-in support for automatically downloading and loading some Linux distributions like Ubuntu, Linuxmint, Arch Linux, Debian, Fedora and so on. Unetbootin is an open source software which is licensed under the GNU General Public License. Unetbootin is a cross-platform tool which you can install on Linux, Windows or macOS.
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There are several tools you can use to make a bootable USB flash drive/hard drive. In addition to burning an ISO file to CD, you can also use it to make a live USB, whether on an USB flash drive or an USB hard drive. Most Linux distros are distributed via ISO files.
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