I want that when Debian boots and I log into gnome and open gnome-terminal, echo $LANG shows en_US instead of en_IN. I found that in /etc/environment, the content was: LANG="en_IN" So, I changed it to LANG="en_US" and rebooted the system. But after rebooting and opening gnome-terminal, I find echo $LANG to output en_IN again. So, where should I make this change so that after rebooting echo $LANG outputs en_US ?