Installing Ubuntu using USB Flash Drive

Create a Bootable Ubuntu USB Flash Drive

You would first need to download the UNetbootin software. This is not a installer, rather just double click on it to run it.Select your options as shown in the image below and press OK button.

The process will extract the files from the ISO image, copy them to the flash drive and then install the bootloader. Depending on what you are installing, this really doesn’t take very long. Once the process is completed, you’ll be prompted to reboot… which you don’t necessarily have to do unless you want to test booting the flash drive on the same machine you are using. Otherwise you can hit the Exit button.
Booting from Flash Drive
Now that you are all finished, you can try and boot from the flash drive. Every BIOS is different, but most of them will have a message like “Press F12 for the Boot Menu”, which is highly suggested. The boot menu will allow you to select the USB drive as the boot device. Instead of the regular Ubuntu boot menu that you might be used to seeing, you will see the UNetbootin menu, which has essentially the same options.