Try this commands to fix this issue:
gconftool-2 --type boolean --set /desktop/gnome/interface/buttons_have_icons
true
gconftool-2 --type boolean --set /desktop/gnome/interface/menus_have_icons true
** Changed in: meta-gnome2 (Ubuntu)
Status: New => Confirmed
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Missing icons in system menu
https://bugs.launchpad.net/bugs/462501
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