Software Updater & Software Center apps not launching

Question

Problem: Clicking the app-icons does not launch anything. I've checked out (and tried some of) these solutions:
software-center-does-not-open-after-update
software-center-wont-open
cant-open-software-center
But my problem doesn't seem to involve icons, rather:

$ software-center
Traceback (most recent call last):
  File "/usr/bin/software-center", line 25, in <module>
    from gi.repository import Gtk, GObject
  File "/usr/lib/python2.7/dist-packages/gi/importer.py", line 158, in     load_module
    introspection_module = get_introspection_module(namespace)
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 271, in get_introspection_module
    module = IntrospectionModule(namespace, version)
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 120, in __init__
repository.require(namespace, version)
gi.RepositoryError: Typelib file for namespace 'GdkPixbuf', version '2.0' not found

Question: Why aren't they lanuching, and how to fix it?

I installed synaptic and it works.

This might be connected to my solved problem: Trouble with APT, DPKG, SYNAPTIC. Linux-Image-thing

Any help is hot :)

Answer 1

The showed error message is about a namespace not found. Try to reinstall it:

sudo apt-get install --reinstall libgdk-pixbuf2.0-0