The nVidia driver you are referring to is proprietary. If you respect your own freedom, you should not install it.

Anyway, I guess it does not hurt to teach you that you can log into a "real" terminal by pressing Ctrl+Alt+F1 (or F2 or ... or F6 for six terminals in parallel). Ctrl+Alt+F7 brings you back to the graphical session. To kill it:
sudo killall gdm-binary

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