I've just installed the NVIDIA graphics driver on Zorin. After rebooting, it gets stuck at the login screen. When I enter my password, the screen flashes and then returns to the login screen, repeating endlessly. I can't get into the system.
What Nvidia Card You have and what Driver did You have installed and how (I mean in the Additional Drivers Tab or over the Terminal)? Are Secure Boot and Fast Boot in BIOS disabled? Is Windows still installed? If yes: Is Fast Start-Up in Windows disabled?
Also once you get your Nvidia drivers working, if your using secure boot, I posted info on making sure the secure boot certs/keys are properly enrolled in the MOK Utility over in Tutorials:
