I have a problem with the 'synaptic' application (GUI version of apt), and was hoping to get some debug output from it. The man page however has just a couple of command line options and this very helpful statement:
"Synaptic accepts all of the standard Gtk+ toolkit command line options as well as the following:"
Unfortunately, there's no indication of how I might determine what those are, and my googlefu has so far been unhelpful..
From another GTK+ application (gnome-terminal) which supports --help-gtk at the command line:
Edit: "chromium-browser -h " gives these this link and this link from library.gnome.org with a useful syopsis (especially the first link).