I recently installed elementary on my laptop, but the screen kept flickering. I followed the instructions on this post https://ubuntuforums.org/showthread.php?t=2061180, but when I restarted my computer there was only a black screen to greet me. I've tried pressing CTRL-ALT-F1 but nothing shows up. I don't know how to fix this since I can no longer log into my account and can't access the terminal
This is a common error when the system doesn't know what driver to use. To install nvidia propretary drivers is quite simple: -You need a piece of software called Software & Updates; Apart from being able to control all the PPA installed and repositories, under the additional drivers section you can swap in-between proprietary drivers for nvidia and the open source Nouveau drivers counterpart.
To install Software & Updates:
sudo apt install software-properties-gtk software-properties-common
I always suggest to create the configuration file at the end of the driver installation: