In that case... let's get rid of it, now. 
sudo apt remove --purge xserver-xorg-input-all
You should be fine with libinput. The xserver-xorg-input may be interferring, so removing it may solve the issue.
If not - or if you have no screen at all, enter recovery mode:
https://forum.zorin.com/t/how-to-enter-recovery-grub-menu-advanced-options-for-zorin/8001/2
Enable networking
Then arrow key down to Drop to Prompt
and reinstall:
sudo apt install xserver-xorg-input-all