gedit is not opening as root user

[Grenage]

In my quantal install /usr/bin/gksudo links to /usr/bin/gksu.

Indeed; sudo and su are different things, but afaik, gksu and gksudo are not.

Edit: I assume this is because it's fine to use su for graphical apps, if you do in fact want to run the apps and config files as root.

[Abhinav Kumar]

Recommending vi or nano is all well and good but what makes me concerned is why OP wants to edit /etc/apt/apt.conf in the first place. I've been using Ubuntu for a little over a year and haven't had the need to do so.

Hi vasa1,
Sorry to interrupt you despite being a new user (as compared to you who has a lot of experience of using linux )

Sometimes people need to access the network through the proxy server. If the proxy requires a username and a password, you need to manually edit the /etc/apt/apt.conf file and write your username and password so that softwares can be installed and even ubuntu can be upgraded through the proxy.

Regards,
Abhinav