This extra option exists for people who don't use gksu or the gnome preferences (xubuntu for example).
** Changed in: synaptic (Ubuntu) Status: Needs Info => Fix Released -- Synaptic should honor the general proxy settings https://launchpad.net/bugs/68749 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs