Gconf-Cleaner is a cleaning up tool for unknown or invalid gconf keys for applications stored in configuration system. This tool is quite handy in case you want to remove preferences to specific application listed on gconf applications database.
I think when ubuntu 9.10 released system menu icons was hidden with default release, as same as with ubuntu 10.04 beta 1
it’s old trick for who don’t know it so there are two ways to get these icons back.
open terminal and type
gconftool-2 --type Boolean --set /desktop/gnome/interface/menus_have_icons True
open configuration editor from system tools
if you can’t find it open terminal and type
then go to Desktop –> Gnome –> Interface
you will find “menus have icons” make this value true