GCC not running

[Mehak]

I am trying to run a C code on my gcc compiler but it gives me a error that file stdio.h not found .

I tried the following things
sudo apt-get install build-essential

directs me to add the cd 'Ubuntu 7.10 _Gutsy Gibbon_ - Release i386 (20071016)',since I dun have the original cd of iso image I loaded the os from can you direct me where to find the above disc.

gksudo gedit /etc/apt/sources.list

doesn't let me save the edited changes in the file

Also the vim editor is not working properly in the insert mode and I am unable to download the emacs editor.

Regards
Mehak

[iaculallad]

To enable you're download via the internet repo and not on your CDROM media, try to follow the following steps below.

Navigate to System->Administration->Software Sources, under the "Ubuntu Software" tab, be sure that the Main, Universe, Restricted, and Multiverse is marked as checked. Uncheck the option w/c says "Installable from CDROM/DVD". Select the "Download From:" to equal to "Main Server". Click on close and open your terminal.


sudo apt-get update && sudo apt-get upgrade
sudo apt-get install build-essential


Retry your GCC application.