How to make "xinput --set-prop 11 "Synaptics Finger" 10 15 100" permanent? [duplicate]
I had the exact same issue. As an alternative to Humpity's answer, I just made a shell script saved in my home directory then added it to my Startup Applications list.
"Startup script.sh":
#!/bin/bash
xinput set-prop "appletouch" "Synaptics Finger" 10, 20, 100
Then open the Startup Applications GUI (which should be installed by default in ubuntu) and add a new entry to the list with the command field like so:
"/home/user_name/Startup script.sh"