unable to change clock from manuell --> ntp -- Could not install package

[LAZA]

To reproduce the steps do:

- add clock to XFCE panel
- right-click --> features
- new(?) option "Time and Date settings" --> new window comes up
- "unlock" with root password
- change "configuration" from 'manuell' to 'time from time server'
-- new window opens up --> NTP is not installed
--- click on "install NTP support"
Error:
Could not install package
The necessary applications to install the package could not be found.

.

Xubuntu 14.04. alpha2

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xfce4-panel 4.11.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
Uname: Linux 3.13.0-11-generic i686
ApportVersion: 2.13.2-0ubuntu5
Architecture: i386
CurrentDesktop: XFCE
Date: Sat Feb 22 08:26:49 2014
InstallationDate: Installed on 2014-02-16 (5 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140121.1)
SourcePackage: xfce4-panel
UpgradeStatus: No upgrade log present (probably fresh install)