Are you loading it on to the USB as an image/ghost or just dragging and dropping.
You probably need to burn it as an ISO file. There is free programs to do this.
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https://www.lifewire.com/how-to-burn-an-iso-file-to-a-usb-drive-2619270
Maybe I should try this instead of using Ubuntu's program
Update: flashing the usb using a software like you suggested instead of the built-in app worked for whatever reason. Thank you for the help!
No worries, message me if you run into any issues.