The gconf key is /desktop/gnome/interface/menus_have_icons.
Note: I don't particularly endorse setting it to "True" in the long run. See Andreas Nilsson's post and the discussion in the related bug for the rationale behind setting it to "False" by default.
The gconf key is /desktop/gnome/interface/menus_have_icons.
Note: I don't particularly endorse setting it to "True" in the long run. See Andreas Nilsson's post and the discussion in the related bug for the rationale behind setting it to "False" by default.
You could also use Ubuntu Tweak. They have an option for that, among many other things. It also allows you to put icons in buttons.