Not sure what happened, updated Ubuntu core, rebooted, and now "Ubuntu" is gone from the desktop environment switcher on the login screen of Ubuntu 14.04.
I want to use Unity.
I have tried re-installing it and completely removing it, it won't budge.
Cinnamon and KDE are the only one's showing up
I had lost the Unity option in the desktop environment switcher after installing Unity8 in Ubuntu 15.04. The problem included a weird situation where even "unity-desktop" did not show up in Synaptic. The solution proved pretty easy (thanks to this thread):
sudo apt-get update
sudo apt-get install --reinstall ubuntu-desktop
sudo apt-get install unity
