Hi @Rosika, I run Linux Mint and had a bad problem with a jumping mouse cursor. I was able to disable the touch screen permanently at
Edit /usr/share/X11/xorg.conf.d/10-evdev.conf
Catch-all evdev loader for udev-based systems.
This may not be the same for Ubuntu but may give you a clue as to where to look.
I also found this on the internet which sounded like it might be a match for you.
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