How do I get a vanilla GNOME after Ubuntu 17.04?
There are two methods to easily gain a more GNOME like experience in Ubuntu 17.10.
The first method is to run the program
sudo apt install gnome-session
This will undo many of the features that have been added to GNOME, such as the always-on dock, but will leave the Ubuntu color scheme.
The second method is to execute the command
sudo apt install vanilla-gnome-desktop
This will install the GNOME themes as expected from prior versions of Ubuntu GNOME, change the Plymouth splash screens, and install several common GNOME utilities.