Main User Menu Gnome Classic empty Workplace

[Linuxonlinehelp_de]

16.04 Fresh Setup AMD64

the Classic Menu of User is empty
see attachment

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nautilus 1:3.18.4.is.3.14.3-0ubuntu4
ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
Uname: Linux 4.4.0-22-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CurrentDesktop: GNOME-Flashback:Unity
Date: Tue May 24 18:12:33 2016
GsettingsChanges:

InstallationDate: Installed on 2016-01-21 (123 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
JournalErrors:
 Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] failed with exit code 1: Hint: You are currently not seeing messages from other users and the system.
       Users in the 'systemd-journal' group can see all messages. Pass -q to
       turn off this notice.
 No journal files were opened due to insufficient permissions.
ProcEnviron:
 LANGUAGE=de_DE
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
SourcePackage: nautilus
UpgradeStatus: Upgraded to xenial on 2016-05-13 (11 days ago)