I ran into some problems after installing Gnome on my Ubuntu 14.04 desktop. I have managed to address most appearance-related issues.
However, if I run
sudo update-alternatives --config x-window-manager I get:
There is only one alternative in link group x-window-manager (providing /usr/bin/x-window-manager): /usr/bin/mutter Nothing to configure.
As far as I know, Mutter is the window manager for Gnome, not Unity. What is the window manager for Unity and how can I install/restore it? (Alternatively, does Unity 7 / 14.04 in fact use Mutter?)