i want to edit the apt.conf.d in ubuntu for proxy settings. how do you go about it ?

Why?

Ubuntu has a built-in “Add / Remove Programs” function, just like Windows, if you haven’t broken it already.

And, nobody even needs to use “APTget” or SUDO anymore., nor do they normally need to use a proxy server.

Please re-post and explain your specific problem, and maybe we can help.