Installing desktop environment from terminal?

Somehow, I managed to remove Zorin's desktop environment (I would guess I purged one package too many when uninstalling nVidia/nouveau drivers); now, when it boots, I only get the text console, no matter which ALT+Fn combination I choose (F1-F5 or F7). Normally, Alt+F1 was the graphical environment.
I still see Zorin-Desktop-Themes and -Sessions installed.
Which package(s) should I install to get Gnome back?

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