Tips and Tricks for Ubuntu after Installation [Ubuntu 14.04 – 15.04]

http://www.techsupportalert.com/content/tips-and-tricks-ubuntu-after-installation-ubuntu-1404.htm

http://www.unixmen.com/top-things-to-do-after-installing-ubuntu-15-04/

Gnome

To install GNOME 3 in Ubuntu 14.10, enter the following command:

sudo apt-get install gnome-shell ubuntu-gnome-desktop

During installation, the installer will ask you to select the login manager of your choice (LightDM is the default Unity manager and GDM is the GNOME default — Both will work).