You will find Macintosh HD under Internal and your connected Pendrive under External, make sure you select the Pendrive as shown in image – 3 Under Utilities select and click Disk Utility to open as shown in image -2 How to create a Ubuntu bootable USB stick on MAC osxĬonnect the Pendrive and I have already downloaded the Ubuntu 20 ISO file and kept on the desktop as shown in the image.Ĭlick on Go – Utilities as shown in the image – 1