I log in (since I can still type at least) and try to see if sudo reboot will magically make things better. It doesn’t.
So I log in graphically and I then press the “Windows”/Super key on the keyboard to access the search menu. I type in “Synaptic” to get to Synaptic Package Manager, select it and get to it’s search feature using the Tab key and the arrows on my keyboard. I search for “pointing” to try and locate a package that handles pointing devices. I find gpointing-device-settings and from the description it sounds like it will solve the problem. Synaptic will let me select it, but I can’t get it to Apply.
So, I close Synaptic using <Alt><F4>, hit the Super key again, search for Terminal, select it using the Tab button, and in the Terminal I enter:
sudo apt-get install gpointing-device-settings
….and after entering my password it installs.
I then enter sudo reboot and when the computer starts up, I finally have my trackpad working again.
These are the kind of bugs that make people worry about trying a Linux distro, or, make them walk away from one when they don’t know what to do.