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[Jostle <1296133@xxxxxxxxxxxxxxxxxx>]

I had the same problem but, following some clues from the comments in this bug, have found a fix.
I had disabled Power Management in System Settings -> Startup and Shutdown -> Service Manager -> Startup Services.
Simply restarting the service immediately gave me back my Suspend buttons!

To restart the service 
- Select the Power Management service
- Enable the 'Use' checkbox
- Click the 'Start' button!! (the 'Status' should change to 'Running'  and your buttons should now be available)
- Click the 'Apply' button

Hope this works for you.

Some more system info ...
> upower -d
Daemon:
  daemon-version:  0.9.23
  can-suspend:     yes
  can-hibernate:   no
  on-battery:      no
  on-low-battery:  no
  lid-is-closed:   no
  lid-is-present:  no
  is-docked:       no
> uname -a
Linux marvin 3.13.0-24-generic #47-Ubuntu SMP Fri May 2 23:30:00 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

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https://bugs.launchpad.net/bugs/1296133

Title:
  Suspend and hibernate missing from KMenu and Power Management in
  System settings

Status in “upower” package in Ubuntu:
  Confirmed

Bug description:
  I have used install scripts to install Kubuntu 14.04 on three
  completely different systems. Although the packages installed are
  basically the same, one of the system has no Suspend/hibernate options
  in the KMenu nor in the Power management in the KDE System settings.
  Since this is a laptop, this also means that the battery life is
  greatly reduced, because it cannot go to standby when lid is closed or
  when it's idle. Interestingly, If I logout,  there is a Standby button
  on the lighdm login screen. If I click it, the laptop goes to standby
  and wakes up without problems.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: upower 0.9.23-2ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-18.38-generic 3.13.6
  Uname: Linux 3.13.0-18-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CurrentDesktop: KDE
  Date: Sat Mar 22 21:18:53 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-03-14 (8 days ago)
  InstallationMedia: Ubuntu-Server 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140130)
  SourcePackage: upower
  UpgradeStatus: No upgrade log present (probably fresh install)

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