I was using Ubuntu 16.04 on my System76 Oryx laptop. The trackpad is very sensitive so I used to disable it using Fn+F1. That is not working anymore in 18.04. I looked around and found:

```
synclient TouchpadOff=1 

```

When I set that it seemed to work for a second then reset...

```
$ synclient TouchpadOff=0
$ synclient | grep TouchpadOff
    TouchpadOff             = 0
$ synclient | grep TouchpadOff
    TouchpadOff             = 1

```

I also found:

```
xinput set-prop "SynPS/2 Synaptics TouchPad" "Device Enabled" 0

```

But that seems more permanent. When I tried to set back to 1, it remains off. Seems I need to reboot now to turn it back on. I used to be able to toggle with Fn+F1.