For display lock

 xinput list

xinput disable (id)

Second method --++++

sudo nano /etc/X11/xorg.conf.d/99-disable-touchscreen.conf

Add the following line 

Section "InputClass"

    Identifier "Disable Touchscreen"

    MatchIsTouchscreen "on"

    Option "Ignore" "on"

EndSection

Save ctrl x

--++sudo reboot

3rd mathod 

lsmod | grep -i touch

echo "blacklist your_driver_name" | sudo tee -a /etc/modprobe.d/blacklist.conf



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