(On some PCs, you may also have to disable Secure Boot, depending on the Linux distribution you choose.) Just insert the resulting USB drive into any computer and boot from the USB device. If you want to be able to save changes and data you need to create a bootable USB drive with persistent storage. Each time you boot into the Ubuntu from this USB drive it will be a fresh instance of Ubuntu. To be clear, this bootable USB drive will boot into a working copy of Ubuntu Linux but it will not save any changes you make.

You will require an Ubuntu installation ISO image to create the bootable USB drive, so make sure you have downloaded the version of Ubuntu you wish to use. When you are ready to install Ubuntu, you can use the USB drive as the installation medium. It allows you to try out the popular Unix-like operating system without making changes to the computer. A bootable USB drive provides the same experience to the user as an Ubuntu Live DVD. For example, Ubuntu Linux has two built-in methods for creating a bootable USB drive.

Mac burn iso image to usb