In spite of my first impressions after some weeks of real use my desktop computer seems to be slowed down by the latest Ubuntu upgrade. The system is still functional but, while using some application, like Firefox, it starts loosing in fluidity. I so decided to try changing the desktop manager installing XFCE in place of Gnome.
Installation
Installing XFCE on Ubuntu is just a one-command matter:
sudo apt-get install xubuntu-desktop