Touchpad not working and not detected when I run 'xinput list', on Ubuntu 20.04

Solution 1:

Two possibilities:

1. Something physically wrong with touchpad, e.g., a connector unpluged due to vibration, or water got into it.
2. Software issues, e.g., a missing or bad driver, or the device was disabled.

In your xinput list output, there is no entry for a touchpad, e.g.,

SynPS/2 Synaptics TouchPad id=12 [slave pointer (2)]

• To see if that device is connected, create a Live Ubuntu Flash USB Stick and boot from it. Run xinput list and see if the touchpad shows. * If the touchpad is not in the list, the issue is likely in hardware, and you should check for loose connections or a bad touchpad.
• If the touchpad is present in the list, the issue is likely in software, so note the touchpad make and model. Then reboot from the HDD or SSD and try reinstalling the drivers shown using Terminal or the Syanaptic Package Manager.