Paulo, try this:
sudo dbus-send --print-reply --system --dest=org.freedesktop.UPower
/org/freedesktop/UPower org.freedesktop.UPower.Hibernate
It worked in my case. "sudo pm-hibernate" also works.
It looks like a permission issue of some sort. I added the upower
package to the bug, let's hope someone else knows what's the problem.
** Also affects: pm-utils (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/961122
Title:
lubuntu-logout is "not authorized" to suspend or hibernate
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