11.10 - Unity - Brightness indicator

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http://askubuntu.com – I followed this tutorial to set the brightness indicator on Unity. But when I run the sudo /opt/indicator-brightness/indicator-brightness.py command from a terminal, I get (indicator-brightness.py:1734): Gtk-WARNING **: Impossible to find the theme engine in module_path : « pixmap » Traceback (most recent call last): File "/opt/indicator-brightness/indicator-brightness.py", line 78, in <module> create_menu(ind) File "/opt/indicator-brightness/indicator-brightness.py", line 46, in create_menu curr_brightness = get_curr_brightness() File "/opt/indicator-brightn (HowTos)