How to add official repositories in Kali Linux 2.0

If you installed the OS offline, you will need to update the repository list to get future updates.
Let's keep this short.
Open sources.list file with any text editor :

 :~# nano /etc/apt/sources.list

Now replace the text in the file with this:

## Regular reppositories

deb http://http.kali.org/kali sana main non-free contrib
deb http://security.kali.org/kali-security sana/updates main contrib non-free

## Source reporitories

deb-src http://http.kali.org/kali sana main non-free contrib
deb-src http://security.kali.org/kali-security sana/updates main contrib non-free



I found the above links here:
http://docs.kali.org/general-use/kali-linux-sources-list-repositories

^ This is the official site. Visit the link for more details.

Now the file should look like this image:

Now run:

:~# apt-get update



WARNING: These 4 links are enough for normal updates and installing packages. Add other repositories only if it's really important.