Ubuntu server 12.04 locate problems

["Diác. C.J.Moretti"]

HI!

After installing ubuntu 4.12, I noticed that when using the command
man, I always get the following message, even showing me the correct 
syntax of the command you want:
man: can not set the locale, make sure $ LC_ * and $ LANG are correct

When enter the line:
export LANG = pt_BR

the problem does not happen ...

How can I fix this detail without having to enter every time the line up?

TKS
Moretti

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