OK. It states there are two packages and it just might be that it needs those to boot? Perhaps kernel updates? When you get to the prompt enter:
- Code:
sudo apt-get update && sudo apt-get dist-upgrade
- I hope you are not using autologin!
If no joy after doing this and rebooting after update, hold the left shift key down whilst powering on to get to GRUB menu and choose 'Advanced options for Zorin - use the recovery option - when you get to it, (ensure that your machine is physically connected to your router), enter DPKG - this will check for any missing dependencies - then don't select 'Continue' but power down then reboot.
Keeep us posted.