Found this at AskUbuntu (rather old though):
askubuntu.com
Sorry for not be of more help. I am not using Ubuntu.
Problem with "gnome-terminal" on Gnome 3.12.2
I have Ubuntu-Gnome 14.04 (Gnome 3.12.2). When I try to run gnome-terminal by following command : $ gnome-terminal Error constructing proxy for org.gnome.Terminal: /org/gnome/Terminal/Factory0: ...
askubuntu.com
Sorry for not be of more help. I am not using Ubuntu.
