Q:

Terminal won't launch after upgrading

After upgrading my laptop from 14.10 to 15.04, the terminal wont' launch. Ctrl+Alt+T does nothing. neither will terminal run from dash. I tried launching gnome-terminal from xterm, but nothing happens. Running htop from xterm shows many instances of gnome-terminal. Any advice anyone?

A:

I guess this is how you fix this.

You can change the locale in /etc/default/locale. You can try setting
  the contents of that file to:
LANG="en_US.UTF-8"
LANGUAGE="en_US"

source
Blog post

