Hi all Debian users. When I freshly installed Debian on my present system, I chose Gnome as my Desktop manager, then I switched to Openbox. To free space, now I want to remove all those Gnome packages that I haven't used any more but am not sure what of them I may delete without perturbing the system. How can I know? More in general, is there a way to know what packages one is not using and so can be removed? Thanks for any help, Rodolfo