Polkit and XRDP remote desktop appear to not coexist

Hi,
I am working mostly over XRDP with my Xubuntu 14.04.
I have massive authorizations problems.
Apparently the policy-kit does not function over a XRDP remote desktop connection.

The software center claims that I haven't gt any authorizations, Synaptic does not start at all...

I would think some parts of the policy kit (tried to install lxpolicy as well without success) wont work over XRDP.
Directly at the computer desktop, it works perfectly.

Have I forgotten something or it is a bug?

Have you got a hint, a workaround?

Thank you a lot.
Michel Firholz

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xrdp 0.6.0-1
ProcVersionSignature: Ubuntu 3.13.0-77.121-generic 3.13.11-ckt32
Uname: Linux 3.13.0-77-generic i686
NonfreeKernelModules: wl
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: i386
Date: Sun Feb 7 23:23:47 2016
InstallationDate: Installed on 2016-01-16 (22 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Release i386 (20140416.2)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: xrdp
UpgradeStatus: No upgrade log present (probably fresh install)