Yes it sounds like the USB stick is faulty/corrupt, if not the USB port.
You might want to consider downloading a fresh copy of Ubuntu from here:
https://www.ubuntu.com/download/desktop/thank-you?version=18.04.1&architecture=amd64
** Package changed: xorg (Ubuntu) => ubuntu
** Changed in: ubuntu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1785531
Title:
i dont know what to write here.
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