If any of your laptop keys are making false key presses, then it is better to disable that one. So we can use an external one without any problems.
This video describes the steps to disable faulty laptop keys.
OS: Ubuntu 18.04
Commands used:
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#!/bin/bash
xmodmap -e ‘keycode 171=’
xmodmap -e ‘keycode 172=’
xmodmap -e ‘keycode 173=’
xmodmap -e ‘keycode 174=’
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xmodmap -pke
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chmod a+x disable_key
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mv disable_key /usr/bin/disable_key
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