Updated 11/03: After doing some test with your suggestions, I only can  be sure about one thing: there is something related to the graphical  environment, because if I login through ssh or using a virtual  terminal, the variable is not defined. Any new idea?I have defined in some persistent way the http_proxy variable. Always I open a terminal, I have the http_proxy already defined.This is not my desired behaviour, so I'm looking where I defined http_proxy environment variable.I'm pretty sure that is something user related, because with other users in the same computer I don't have the problem.I have checked the .bashrc and other bash-related configuration files, but any of them include the http_proxy variable definition.Obviously, I can unset de variable without any problem, but I want to know where the hell is the variable defined.Thanks in advance
Unset http_proxy enviroment variable
bash;environment variables;proxy