On November 2021 I tried the method in the post below, Using Touchpad Indicator utility;
and it solved the 'cursor jumping randomly' problem :
https://ostechnix.com/how-to-automatically-disable-touchpad-when-typing-in-ubuntu/
Below is from the above webpage :
- Using Touchpad Indicator utility -
$ sudo add-apt-repository ppa:atareao/atareao
$ sudo apt update
$ sudo apt install touchpad-indicator
After Touchpad Indicator is installed, launch it from Menu or application launcher; find it ( a little applet icon) on the panel (task bar).
Click Touchpad Indicator icon >> Choose Preferences >> Select Actions tab >> check box "Disable touchpad on typing" >> Click OK
** Other info **
Default is 800 ms ( 0.8 seconds); can increase to e.g. 2 or 3 seconds and see how it goes.
For Auto Start, go to Preferences >> "General Options" tab >> Enable "Autostart".
Linux on my laptop is: Ubuntu 20.04