after installing Ubuntu Gnome 13.04, suspend option is gone from gnome power settings and also from "shutdown menu/window". (the option was available with ubuntu gnome 12.10 and it was working perfectly, either closing the lid, using the "shutdown menu/window" or with the power button).
I can run
sudo /etc/acpi/
and it works, but only if I run it with sudo, and using a terminal every time I want to suspend is not very user-friendly. Any idea how to recover this option?