Use this app the make your ubuntu boot disk https://unetbootin.github.io/ //pick a thumb drive “Make sure you set your bios to boot to USB first” I have used this drive before its quick https://www.amazon.com/PNY-Turbo-128GB-Flash-Drive/dp/B00FE2N1WS/ref=sr_1_18?ie=UTF8&qid=1538636993&sr=8-18&keywords=usb+3.0+thumb+drive+128gb But I prefer this drive https://www.amazon.com/GorillaDrive-Ruggedized-128GB-Flash-Drive/dp/B07DV5F9J9/ref=sr_1_1?ie=UTF8&qid=1538637067&sr=8-1&keywords=gorilla+drive+128gb If you don’t want to use the CLI “Command Line Interface” Here is a screenshot