[ubuntu] gnome-terminal doesn't work in 12.04 but it's in the repository

I like to use gnome-terminal, I always have. I think it's better than Konsole because it's no frills and is just a simple terminal.

When I run it I get:

(gnome-terminal:15435): Gtk-ERROR **: GTK+ 2.x symbols detected. Using GTK+ 2.x and GTK+ 3 in the same process is not supported
(core dumped)

What to do?