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I installed or uninstalled some packages. I do not even remember what I was doing. As a result, now I can't see most of the system settings in settings window. Any idea how to solve this problem.

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When I hover mouse over the window title, it shows 'Unknown Application name' I must have removed something, not sure what :-)

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I am facing the same issue :( . Thanks mate for putting up the question before –  kaushik gandhi May 15 at 8:11
    
I encountered the same problem after addressing problems with sound (following a suggestion to remove and reinstall alasbase and pulseaudio - this fixed my sound problem). Reinstalling ubuntu-desktop worked for me (and sound still working) –  AnGus Jun 5 at 0:44
    
Reinstalling ubuntu-desktop solved my sound problem which couldnt be helped by reinstalling alsa and pulseaudio. Thanks a lot –  devrimerdol Jun 18 at 9:17

3 Answers 3

up vote 25 down vote accepted

You may have accidentally removed some packages (or some dependencies which caused the package to uninstall). In any case, you may try installing (or re installing) the package ubuntu-desktop. Correct any accidental package uninstallation by:

sudo apt-get install ubuntu-desktop
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Wow, magic, magic. Love it. Thanks worked like a charm. I still don't know what triggered this to happen. I didn't uninstall any package. –  Indigo Apr 23 at 8:10
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same problem here Indigo and I was just playing with sound... thx cshubhamrao –  Trki Apr 29 at 14:16
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Also came a cross this problem wile experiencing sound problems and trying to fix them. Think it happened when I reinstalled alsa-base and pulsesound. –  Thomas K Jul 10 at 7:20
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Excellent. It works..I faced this issue after uninstalling ibus. –  Desingh Aug 9 at 14:39
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sudo apt-get install unity-control-center is probably all you need, not the entire ubuntu-desktop –  David Underhill Aug 17 at 0:36

Uninstall and then reinstall System Settings (unity-control-center) from the Ubuntu Software Center application.

Or run this command in terminal

  1. sudo apt-get remove unity-control-center
  2. sudo apt-get install unity-control-center
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+1 This completely fixes the issue for me without reinstalling all the other stuff that comes with ubuntu-desktop, and is the best answer here. –  Jason C Jul 7 at 19:45
    
Did the trick for me, though line #1 said unity-control-center wasn't installed, but second line did it. I've been messing with my 14.04 Ubuntu recently, installed Cinnamon, removed some stuff, and disabled some services, etc, so no clue what cased settings appear like that, but i am pretty sure installing cinnamon played into it some how. Good answer, though -minimalistic and practical –  Xieerqi Nov 13 at 6:15

If reinstalling ubuntu-desktop still doesn't cut it for you, you may access system settings in a wrong way. Try to open them directly from a terminal (rather than a bogus shortcut like I was):

    gnome-control-center
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