Using one of the many versions of Ubuntu but want to use a different window manager than the one it came with? This can be done quickly and easily by installing the window manager you wish to use and logging out and back in. Sound simple enough? It is.
To install your new window manager you can use the following commands through a terminal.
sudo apt-get install lxde
sudo apt-get install xubuntu-desktop
sudo add-apt-repository ppa:gnome3-team/gnome3 sudo apt-get update sudo apt-get install gnome-shell
sudo apt-get install kde-plasma-desktop
No sound after rebooting into XFCE or other window manager read No Sound After Installing XFCE/Xubuntu