Installing kubuntu-active breaks KDE Plasma Workspace

[Ibrahim M. Ghazal]

I tried this in a new virtual machine (in VirtualBox) to make sure it's reproducible:

1- Install Kubuntu from the ISO.
2- apt-get update && apt-get upgrade
3- apt-get install kubuntu-active
4- Restart the computer
5- Try to log in into a KDE Plamsa Workspace session
6- After the loading animation and the intro sound, the screen turns black and nothing happens

I realize Plasma Active is not ready for general use, but installing it shouldn't break other packages, and it shouldn't make KDE unusable.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: kubuntu-active 1.276
ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Tue May 21 11:00:06 2013
InstallationDate: Installed on 2013-05-20 (0 days ago)
InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
MarkForUpload: True
ProcEnviron:
 TERM=linux
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kubuntu-meta
UpgradeStatus: No upgrade log present (probably fresh install)