If you manage to bork your system locales in Debian, here’s a fix that works for me.Debian_logo

Open a terminal window and enter the following in sequence…

sudo apt-get purge locales

sudo aptitude install locales

and finally the infamous:

sudo dpkg-reconfigure locales

This should allow you to set things up correctly once again, or perhap for the first time.

This tip was modified from the original on Serverfault