How to restore sources.list file on Ubuntu

I recently messed up with my Ubuntu 12.04 /etc/apt/sources.list file.
In order to restore it you need to run

software-properties-gtk

This will cause a window to appear,

I have chosen only Canonical-supported free and open-source software(main), you can choose other options you want.

This adds the following line to my blank/previously in-existent /etc/apt/sources.list

deb http://archive.ubuntu.com/ubuntu precise main

Now, run apt-get update and other apt-get commands as usual.

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