Traceback (most recent call last):
  File "/usr/lib/ubiquity/bin/ubiquity", line 573, in <module>
    main(oem_config)
  File "/usr/lib/ubiquity/bin/ubiquity", line 558, in main
    install(args[0], query=options.query)
  File "/usr/lib/ubiquity/bin/ubiquity", line 238, in install
    wizard = ui.Wizard(distro)
  File "/usr/lib/ubiquity/ubiquity/frontend/gtk_ui.py", line 260, in __init__
    gtk.window_set_default_icon_from_file('/usr/share/pixmaps/'
GError: Couldn't recognize the image file format for file '/usr/share/pixmaps/ubiquity.png'