Problem: Clicking the app-icons does not launch anything. I've checked out (and tried some of) these solutions:
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 :)

  • This one ultimately worked for me: edit file: /usr/share/icons/default/index.theme and make sure "Inherits=" line includes icon theme that contains this missing iconm, eg: Inherits=elementary,Humanity
    – Sysfu
    Commented Apr 11, 2016 at 15:45
  • $ cat /usr/share/icons/default/index.theme [Icon Theme] Name=elementary Inherits=elementary,Humanity Still ain't launching. How do I know what theme is missing?
    – neb
    Commented Apr 16, 2016 at 9:10

1 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
  • $ sudo apt-get install --reinstall gdk-pixbuf … Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package gdk-pixbuf
    – neb
    Commented Apr 16, 2016 at 9:06
  • Sorry, my fault. I've indicated the source package.
    – bitseater
    Commented Apr 16, 2016 at 10:20
  • No problem anymore. Heading for the VOID rather than the bloat…
    – neb
    Commented Aug 6, 2018 at 23:23

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