I have installed, on my rpi , the Operating System Raspian and when i try raspi-config boot throught the autologin-desktop start LXDE. I would like starting the desktop of OPENBOX and uninstall the desktop of raspian. How can be done?Thank you
I get the feeling you don't fully understand the difference between services like Openbox and Xorg.
Openbox is a window manager (much like LXDE, which is built on top of Openbox itself), so you can just apt-get install it. Whereas startx is a command from the Xorg package.
If you want to use Openbox instead of LXDE, you need to edit your .xinitrc file, located in your user folder, or edit the global xinitrc file, located at /etc/X11/xinit/xinitrc.
You'll need to replace exec startlxde with exec openbox-session.