Public bug reported:

In line 420 /usr/bin/xdg-screensaver checks for the value of 
KDE_SESSION_VERSION.
If it is 4, it uses the dbus methods, otherwise, thinking it is kde 3, it uses 
dcop.
Unfortunately now KDE_SESSION_VERSION is 5 and xdg-screensaver falls back to 
dcop (which doesn't exists anymore):

$ xdg-screensaver suspend 0x2600007
/usr/bin/xdg-screensaver: 652: /usr/bin/xdg-screensaver: dcop: not found


Changing it to check for 5 instead of 4 at least it appears to work (barring 
bug #310351)

Note that the rest of xdg-utils also check KDE_SESSION_VERSION, so they
will probably fail too, but I didn't try them.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xdg-utils 1.1.0~rc1-2ubuntu10 [modified: usr/bin/xdg-screensaver]
ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8
Uname: Linux 3.19.0-21-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Jun 23 19:39:45 2015
PackageArchitecture: all
SourcePackage: xdg-utils
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xdg-utils (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1468030

Title:
  xdg-screensaver broken in kubuntu (KDE_SESSION_VERSION is 5, not 4
  anymore)

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