unsupported locale problem

[csj <csj@myrealbox.com>]

I stuck this into /etc/environment

LANG=en_IN

Now I get these ~/.xsession-errors when I try to start fluxbox as a gdm
session (which runs it as "exec /etc/X11/Xsession /usr/bin/fluxbox"):

Warning: Failed to open catalog, using default messages.
Warning: X server does not support locale
Warning: cannot set locale modifiers
Faild to load groupfile: 
BScreen::BScreen: managing screen 0 using visual 0x23, depth 16
Failed to load font: lucidasans-10
Failed to load font: -*-lucida-bold-r-*-*-11-*-*-*-*-*-*-*
Failed to load font: lucidasans-10
Failed to load font: lucidasans-10
Failed to load font: lucidasans-10
Warning: Failed to open catalog, using default messages.
XIO:  fatal IO error 104 (Connection reset by peer) on X server ":20.0"
      after 0 requests (0 known processed) with 0 events remaining.

Can somebody decipher this and possibly suggest a solution? I need to
set LANG=en_IN to tame a certain console app that won't yield peacefully
to LANG=en_US.UTF-8.