This seems to be a problem I've not been able to fix when building the latest Xfce on Ubuntu.
The Quit menu loses the hibernate and suspend buttons.
How do I fix this?
On the version of Xfce with Ubuntu, they were there and worked fine. So what is it about Ubuntu's configuration that isn't telling Xfce's configuration that the system can hibernate and suspend?
[FIX] Ok, I've forgotten that this is because Ubuntu patches Xfce. However, one can obtain the patches (and .deb package files for some Xfce bits!) at http://archive.ubuntu.com/ubuntu/pool/main/
which deb did u used?