[xubuntu] Install a proxy manager

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http://ubuntuforums.org – Hello all, Since i've came on linux, i know that XFCE is my favorite desktop environment. I really love this simplicity, this speed etc. But their is one thing poisoning my life, the absence if proxy manager... I know there is a command to set a proxy (export http_proxy=<proxy>:<port>). But it don't work with my university proxy which is an i don't know what proxy (proxyweb.utc.fr:3128). It seems to not be http nor than https... I'm writting here because i would like to know if it is possible to install a proxy manager (like on any other desktop environment based on gnome 2). If (Hardware)