~/.profile vs ~/.pam_environment

[Lars Nooden]

I read that the help document on environment variables [1] points to 
~/.pam_environment and /etc/environment as where to change variables.  

I notice that ~/.pam_environment is not present in Lubuntu (saucy) 
and that changes to /etc/environment do not have effect, even when 
removing ~/.profile

Are ~/.pam_environment and /etc/environment changes that are pending?

Regards,
/Lars

[1]	https://help.ubuntu.com/community/EnvironmentVariables