hibernate doesn't work, even after following instructtions on how to enable it.

I have followed the guide here: https://help.ubuntu.com/12.04/ubuntu-help/power-hibernate.html on how to check and enable hibernate but it didn't work for me.

1. lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04

2. apt-cache policy pm-utils
pm-utils:
  Installed: 1.4.1-9
  Candidate: 1.4.1-9
  Version table:
 *** 1.4.1-9 0
        500 http://kartolo.sby.datautama.net.id/ubuntu/ precise/main amd64 Packages
        100 /var/lib/dpkg/status

3. I'm filing this as a bug because hibernate worked fine in version in Ubuntu10.04 on this same computer. Now, on a fresh install of Xubuntu 12.04 it doesn't work.

4. It doesn't resume back.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: pm-utils 1.4.1-9
ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
Uname: Linux 3.2.0-24-generic x86_64
ApportVersion: 2.0.1-0ubuntu7
Architecture: amd64
Date: Mon May 7 22:59:16 2012
EcryptfsInUse: Yes
InstallationMedia: Xubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_PH:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_PH.UTF-8
 SHELL=/bin/bash
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)