The button in Software Center→Edit→Software sources... is disabled.
Is there another way to reach it or simple enable the button? What could be causing it?
If I know I can fix it myself and avoid happening again. Thanks!
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I figured everything out.
For some reason, my System Settings process was called
gnome-control-center. Since it seemed buggy, I removed it:
sudo apt-get remove --purge gnome-control-center
... expecting to then reinstall it to see if it would behave better.
After the uninstall I tried to access it from the top right system button and guess what... It DID show up with all the configuration buttons!
I have two guesses:
Anyway. There is the info for anyone crossing this issue. I have seen other people in the same situation around the web. I hope this helps someone.
Editor's Addition (by Anwar)
It's the installation of gnome packages and not removing them cleanly.
gnome-control-center is GNOME3 sessions part and not meant to be used in Unity.
In Kubuntu 14.04 use Muon Discover. Just type
muon discover in the search field of Kmenu or go to
**Kmenu > applications > system > software center (Muon discover) [with blue icon].
In muon discover choose the "sources" tab at the top of the window. Then click on configure software sources in the top right corner, enter your password, and enjoy!
Is there another way to reach it ... ?
I think you can directly access it through Software & Updates either from the dashboard or from the System Settings panel (in the shutdown button).
Now for the second part of the problem:
ubuntu-desktop as proposed here