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Solved: Configure Kali Linux mirrors after offline installation

The Kali Linux distribution has two repositories, which are mirrored world-wide:
When using the default hosts listed above, you’ll automatically be redirected to a mirror site which is geographically close to you, and which is guaranteed to be up-to-date. If you prefer to manually select a mirror, click on the mirrorlist link near each host-name above and select a mirror that suits you. You will then need to edit your /etc/apt/sources.list file accordingly with the chosen values.
The issue of Mirror installation mainly happen when you skip Mirror configuration during the installation. But never mind if you skip it to allow clear installation of your Os.
Lack of Kali Linux Mirror during Installation can course the problem from update and upgrade of Kali Linux application and resources from the Server.

NB:
Important Note to be taken.....You must add an official Kali Linux Sana Repository Package for you Mirror.

Step 1: 
Navigate to /etc/apt/sources.list

Make sure you have Permission to access the file and open it on the text-editor.

Step 2:
On the sources.list file on the text-editor, remove all comment on every line of code on your list and make sure you add all the following line as it can be seen.
deb http://http.kali.org/kali kali main non-free contrib
deb-src http://http.kali.org/kali kali main non-free contrib
deb cdrom:[Debian GNU/Linux 2017.1 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 20170416-02:08]/ kali-rolling contrib main non-free

deb cdrom:[Debian GNU/Linux 2017.1 _Kali-rolling_ - Official Snapshot amd64 LIVE/INSTALL Binary 20170416-02:08]/ kali-rolling contrib main non-free
deb http://http.kali.org/kali kali-rolling main contrib non-free

Save the file sources.list and Try to update from the Terminal.