Question: 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: 
Error calling StartServiceByName for org.gnome.Terminal:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: 
Process /usr/lib/gnome-terminal/gnome-terminal-server exited with status 8

```

Answer: 
You have to add `LANG=en_US.UTF-8` to `/etc/default/locale` and reboot your system. (Solution from [this Arch Linux forum post](https://bbs.archlinux.org/viewtopic.php?id=180103).)
Execute sudo dpkg-reconfigure locales in an alternative terminal emulator and select en\_US.UTF-8 UTF-8 , choose it as the default locale. gnome-terminal should work.