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: 
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

You have to add LANG=en_US.UTF-8 to /etc/default/locale and reboot your system. (Solution from this Arch Linux forum post.)

Here is the list of commands which helps me:

sudo apt install dconf-cli

# Reinstalling terminal
dconf reset -f /org/gnome/terminal
sudo apt-get remove gnome-terminal
sudo apt-get install gnome-terminal

# Reconfiguring locale
sudo locale-gen --purge
sudo dpkg-reconfigure locales

reboot

As you can see I just reconfigured the locale and reinstall gnome-terminal

This is a winner for me:

/usr/bin/dbus-launch /usr/bin/gnome-terminal &

as learned here

This might be an issue with your locales. Either add LANG=en_US.UTF-8 to /etc/locale.conf and reboot or delete that file altogether (sudo rm /etc/locale.conf && sudo locale-gen en_US.UTF-8 && sudo dpkg-reconfigure locales) and reboot.