Atualização no plugin de busca para Firefox e Internet Explorer.
/usr/lib/ruby/1.8/rexml/source.rb:131:in `initialize': undefined method `[]' for nil:NilClass (NoMethodError) from /usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:126:in `stream=' from /usr/lib/ruby/1.8/rexml/parsers/baseparser.rb:100:in `initialize' from /usr/lib/ruby/1.8/rexml/parsers/treeparser.rb:8:in `initialize' from /usr/lib/ruby/1.8/rexml/document.rb:178:in `build' from /usr/lib/ruby/1.8/rexml/document.rb:45:in `initialize' from /usr/lib/ruby/1.8/gnome-art/get_art.rb:275:in `get_themes' from /usr/lib/ruby/1.8/gnome-art/ui/main_window.rb:520:in `reload_themes' from /usr/lib/ruby/1.8/gnome-art/ui/main_window.rb:514:in `reload_themes' from /usr/lib/ruby/1.8/gnome-art/ui/main_window.rb:754:in `reload_content' from /usr/lib/ruby/1.8/gnome-art/ui/main_window.rb:124:in `on_menu_art_desktop_themes_application_activate' from /usr/lib/ruby/1.8/libglade2.rb:44:in `connect' from /usr/lib/ruby/1.8/gnome-art/gnome_art.rb:132:in `main' from /usr/bin/gnome-art:25
Tenta instalar o Ruby senão atualizar ele.