I am not entirely sure what corrected the problem, but here are all of
the steps I performed:

sudo apt-get install lightdm
sudo dpkg-reconfigure lightdm
sudo systemctl enable lightdm.service
sudo reboot

rm -rf .cache/compizconfig-1
rm -rf .compiz
rm -rf .Xauthority 
rm -rf .config/autostart
dconf reset -f /org/compiz
setsid unity

At this point, Unity sprang to life for me.

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  Ubuntu 16.04 - Unity desktop session broken when using non-LightDM as
  X Display Manager

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