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I am running Ubuntu GNOME 15.10 with GNOME 3.18, however when going into the Details section of the gnome-control-center it tells me just under the logo that I am running 16.04, though it then below says Ubuntu 15.10 64-bit (I have put a black box on the some of the information that I do not wish to be shown):

enter image description here

This is very strange, so I am wondering why this is the case? I am not running 16.04, so why does it say that I am?

Information Update:

The output of lsb_release -a is:

No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 15.10
Release:    15.10
Codename:   wily

And the output of apt-cache policy base-files gnome-shell is:

base-files:
  Installed: 7.2ubuntu11
  Candidate: 7.2ubuntu11
  Version table:
 *** 7.2ubuntu11 0
        500 http://archive.ubuntu.com/ubuntu/ wily/main amd64 Packages
        100 /var/lib/dpkg/status

gnome-shell:
  Installed: 3.18.2-0ubuntu2~wily1
  Candidate: 3.18.2-0ubuntu2~wily1
  Version table:
 *** 3.18.2-0ubuntu2~wily1 0
        500 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu/ wily/main amd64 Packages
        100 /var/lib/dpkg/status
     3.16.4-0ubuntu1 0
        500 http://archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages
     3.16.3-1ubuntu6+wily1 0
        500 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/ wily/main amd64 Packages
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1  
Odd that you didn't include lsb_release output as usual. What is the output of lsb_release -a and apt-cache policy base-files? – muru Jan 17 at 21:12
    
@muru: Sorry, I was going to, but then I just sort of got distracted and forgot... Anyway, I've updated it to include that information now. – Paranoid Panda Jan 17 at 21:17
    
GNOME Shell 3.16.4, NOREPRO. Sounds like a bug. Are you using GNOME from the GNOME repository? – kos Jan 17 at 21:19
    
@kos: I have installed GNOME 3.18 from the gnome3 and gnome3-staging PPAs. – Paranoid Panda Jan 17 at 21:23
    
GNOME3 Staging is a testing branch. Reporting the description: "The packages here have been deemed not ready for general use, they have known bugs and/or regressions, sometimes of a critical nature.". So 99% that's a bug, or hardcoded as Fabby suggests below. Please add the output of apt-cache policy gnome-shell. – kos Jan 17 at 21:28
up vote 2 down vote accepted

Ubuntu 15.10 still comes with Gnome 3.16 by default.

GNOME 3.18 is the one that will be released (at the time of this writing) with Ubuntu GNOME 16.04, and gnome-control-center is directly backported from 16.04 on the GNOME 3 Staging PPAs with the Ubuntu GNOME 16.04 logo patched into it at build time.

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Actually, it comes with GNOME 3.16. The odd numbered releases are the in-development versions, the even numbered releases are the stable releases. – Paranoid Panda Jan 17 at 21:25
    
@ParanoidPanda FWIW, on Arch Linux, which has pretty much vanilla packages, it displays the GNOME version there: i.stack.imgur.com/lXQDB.png - pretty clear it's been patched to display something else. – muru Jan 17 at 21:39
1  
@muru: Thanks for the edit and upvote... – Fabby Jan 17 at 22:34

You're running a GNOME version from the GNOME3 Staging PPA, which is a testing branch for the main GNOME3 PPA.

Copying the relevant part from the description:

This PPA will be used to test uploads before they are copied to the main GNOME 3 PPA.

=== WARNING ===
The packages here have been deemed not ready for general use, they have known bugs and/or regressions, sometimes of a critical nature. Mostly things should run smoothly but be prepared to use ppa-purge, when you encounter issues!

So unless the reported Ubuntu version is (at least currently) hard coded / by design as Fabby suggests that's due to an incomplete implementation / bug.

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