Stuck in TTY after install. Seemingly full functionality except for the lack of any GUI
Solution 1:
This answer solved my problem. It says to use:
sudo ubuntu-drivers install
Which worked like a charm.
I also used:
sudo apt-get install --reinstall ubuntu-desktop
Which "fixed" startx; however, I'm not sure if it actually did anything. Perhaps sudo ubuntu-drivers install is all I needed.
Cheers.