If you have only one USB flash drive plugged in to your computer, Startup Disk Creator will select it automatically. Startup Disk Creator will automatically format your USB flash drive to FAT32 and make it bootable. The USB flash drive that you use with Startup Disk Creator should be 2GB or larger, and for Ubuntu 18.04 and later it should be 4GB or larger. Search the Dash for Startup Disk Creator and click the Startup Disk Creator icon to open the Make Startup Disk window. Ubuntu has a built-in application for creating a bootable Ubuntu live USB for installing Ubuntu called Startup Disk Creator. How to make an Ubuntu USB on Ubuntu using Startup Disk Creator Need help regarding dd command on Ubuntu app for Windows 10.How to create a bootable USB stick on Windows.This flowchart shows how to make a bootable USB for installing Ubuntu and troubleshoot problems booting Ubuntu from it.