Have you seen this?
https://forums.linuxmint.com/viewtopic.php?t=174755
I suspect the touchpad is just switched off.
There's nothing glaringly obvious that is the root of the cause, but I doubt it is a problem that will affect you. You probably need a firmware update, although Toshiba probably haven't done one.
I'll give the fn - F5 in Windows ploy a try later, thanks.