How to download a new Ubuntu .iso on a live USB

boot usb system-installation live-usb 20.04

Delete everything on the useless corrupted Ubuntu live USB. Download the Ubuntu .iso file again, and check its MD5 checksum with md5sum or its SHA256 checksum with sha256sum.

cd ~/Downloads/
md5sum ubuntu-20.04-desktop-amd64.iso

Create a new Ubuntu live USB. There is an application on the Ubuntu live USB for creating a bootable Ubuntu live USB. The application is named Startup Disk Creator and it can be launched from the terminal with usb-creator-gtk . If you're running Startup Disk Creator from an Ubuntu live USB you need to find another portable drive on which to create the new Ubuntu installation media, so you don't overwrite the USB flash drive that you're running the Ubuntu live session from. If you intend to have two USB drives plugged in to the computer at the same time, you can tell which USB drive you're running the Ubuntu live session from by checking its Device name in the built-in Disks application before you plug the new USB drive into the computer.

Boot from the new Ubuntu live USB, and start the Ubuntu installer. Install Ubuntu again.

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