Mi vieja técnica para deshabilitar el touchpad no anda en lubuntu 20.04. Así que tuve que googlear de nuevo cómo se hace.
Para ver todos los devices de entrada de X-Windows hay que correr
$ xinput list
⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ Telink 2.4G Mouse id=11 [slave pointer (2)]
⎜ ↳ Telink 2.4G Mouse Consumer Control id=12 [slave pointer (2)]
⎜ ↳ SynPS/2 Synaptics TouchPad id=16 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Power Button id=6 [slave keyboard (3)]
↳ Video Bus id=7 [slave keyboard (3)]
↳ Power Button id=8 [slave keyboard (3)]
↳ Logitech Logitech G430 Gaming Headset id=9 [slave keyboard (3)]
↳ Telink 2.4G Mouse System Control id=10 [slave keyboard (3)]
↳ CHICONY HP Basic USB Keyboard id=13 [slave keyboard (3)]
↳ HP TrueVision HD Camera: HP Tru id=14 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=15 [slave keyboard (3)]
↳ HP Wireless hotkeys id=17 [slave keyboard (3)]
↳ HP WMI hotkeys id=18 [slave keyboard (3)]
↳ Telink 2.4G Mouse Consumer Control id=19 [slave keyboard (3)]
En mi compu el touchpad tiene el id 16, así que para apagarlo hay que correr xinput --disable "SynPS/2 Synaptics TouchPad" y para prenderlo xinput --enable "SynPS/2 Synaptics TouchPad"
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