Gtk-Message: Failed to load module "canberra-gtk-module"
Traceback (most recent call last):
  File "/usr/bin/lubuntu-software-center", line 23, in <module>
    import LSC.main
  File "/usr/lib/python2.7/dist-packages/LSC/main.py", line 33, in <module>
    import threadingops
  File "/usr/lib/python2.7/dist-packages/LSC/threadingops.py", line 11, in <module>
    from aptdaemon import client, gtk3widgets
  File "/usr/lib/python2.7/dist-packages/aptdaemon/gtk3widgets.py", line 47, in <module>
    from gi.repository import Vte
  File "/usr/lib/python2.7/dist-packages/gi/importer.py", line 76, in load_module
    dynamic_module._load()
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 247, in _load
    version)
  File "/usr/lib/python2.7/dist-packages/gi/module.py", line 86, in __init__
    repository.require(namespace, version)
gi.RepositoryError: Requiring namespace 'Gtk' version '2.0', but '3.0' is already loaded