I want to set it at startup in Ubuntu. Currently I have to manually set it after starting up.
closed as off topic by Shane Madden♦, Ward, voretaq7♦, Chris S♦, Holocryptic Jan 24 '12 at 13:54
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You can add it to the /etc/environment file, making it part of every user's environment.
To apply this change while the system is still running, use
Recommended reading: Enviroment Variables - Ubuntu community documentation.