I bought a new PC, so install Ubuntu. Create a bootable USB memory for installation. Set up the USB memory on Ubuntu.
Basically, work as described on the official website below. Create a bootable USB stick on Ubuntu https://ubuntu.com/tutorials/create-a-usb-stick-on-ubuntu
There are also Windows and Mac versions. Create a bootable USB stick on Windows https://ubuntu.com/tutorials/create-a-usb-stick-on-windows
Create a bootable USB stick on macOS https://ubuntu.com/tutorials/create-a-usb-stick-on-macos
What you need https://ubuntu.com/tutorials/create-a-usb-stick-on-ubuntu#2-requirements ・ Empty USB memory of 4GB or more (Note that all data on the USB memory will be deleted) ・ Ubuntu Desktop 14.04 or above -Downloaded Ubuntu ISO file
Startup Disk Creator https://ubuntu.com/tutorials/create-a-usb-stick-on-ubuntu#3-launch-startup-disk-creator Insert the USB memory Start Startup Disk Creator $ usb-creator-gtk
Creating a bootable USB https://ubuntu.com/tutorials/create-a-usb-stick-on-ubuntu#4-iso-and-usb-selection When you start the app -List of ISO images placed in the download folder ・ List of USB memory connected to PC Can be seen. Select the one you want to use from each list and press the "Create Bootable USB" button. This completes the bootable USB. Very easy.