If you have gnome-terminal running, and want a new instance of the program, you might think that running gnome-terminal & from a shell would do the trick.Astonishingly, this new instance behaves like some insipid Windows or Mac program; it only sends a message to the existing, running gnome-terminal to create a new window. If this one gnome-terminal process crashes, you lose all of the terminal windows!(Of course, each window has its own shell, which is an independent process, but the actual terminal emulator and its GUI are managed from a single instance of the application.)How can we create independent instances of gnome-terminal, each running in their own process, so that killing that process only destroys the window(s) associated with that process? 
Run true multiple process instances of gnome-terminal
gnome terminal
According to man gnome-terminal, the option you're looking for appears to be the confusingly-named   --disable-factory             Do not register with the activation name server, do              not re-use an active terminal.However, the option is apparently removed in more recent releases so should not be relied on. 