Getting errors trying to install UNetbootin in order to reinstall Ubuntu

apt repository updates live-usb reinstall

There are complicated alternative ways to reinstall Ubuntu without using any installation media such as debootstrap, but getting temporary access to a USB flash drive for a few hours will greatly simplify reinstalling Ubuntu even if you have to borrow one.

You don't need to install anything in order to put the Ubuntu installer on a USB flash drive, because there is already an application for that purpose which is built-in in Ubuntu called Startup Disk Creator. For information on how to use Startup Disk Creator see this question: What is the proper way of creating installation media from Ubuntu iso?.

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