libqt4-multimedia package broken

libqt4-multimedia:
- is still in beta version
- its dependencies are only on beta version, but rc packages are being installed

I'm using AMD64 Lucid distribution:
# uname -m
x86_64

Updating from kde 4.5 to 4.5.1

# aptitude full-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Reading extended state information
Initialising package states... Done
The following packages are BROKEN:
  libqt4-multimedia
The following NEW packages will be installed:
  libmediastreamer0{a} libortp8{a} libspeexdsp1{a} libutempter0{a}
The following packages will be upgraded:
  amor aurorae-themes-artwork bomber bovo cantor
...

The following packages are RECOMMENDED but will NOT be installed:
  translate-toolkit virtuoso-minimal
337 packages upgraded, 4 newly installed, 0 to remove and 0 not upgraded.
Need to get 366MB/366MB of archives. After unpacking 1,323kB will be used.
The following packages have unmet dependencies:
  libqt4-multimedia: Depends: libqtcore4 (= 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6) but 4:4.7.0~rc1-1ubuntu1~lucid1~ppa1 is to be installed.
                     Depends: libqtgui4 (= 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6) but 4:4.7.0~rc1-1ubuntu1~lucid1~ppa1 is to be installed.
The following actions will resolve these dependencies:

Remove the following packages:
libqt4-multimedia
python-qt4-dbg
python-qt4-phonon-dbg
Score is -459

Accept this solution? [Y/n/q/?] q

# apt-cache policy libqt4-multimedia
libqt4-multimedia:
  Installed: 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6
  Candidate: 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6
  Version table:
 *** 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6 0
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu/ lucid/main Packages
        100 /var/lib/dpkg/status
     4:4.6.2-0ubuntu5 0
        500 http://ftp.caliu.cat/pub/distribucions/ubuntu/archive/ lucid/main Packages
        500 http://es.archive.ubuntu.com/ubuntu/ lucid/main Packages

# apt-cache policy libqtcore4
libqtcore4:
  Installed: 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6
  Candidate: 4:4.7.0~rc1-1ubuntu1~lucid1~ppa1
  Version table:
     4:4.7.0~rc1-1ubuntu1~lucid1~ppa1 0
        500 http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu/ lucid/main Packages
 *** 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6 0
        100 /var/lib/dpkg/status
     4:4.6.2-0ubuntu5 0
        500 http://ftp.caliu.cat/pub/distribucions/ubuntu/archive/ lucid/main Packages
        500 http://es.archive.ubuntu.com/ubuntu/ lucid/main Packages

In http://ppa.launchpad.net/kubuntu-ppa/backports/ubuntu/dists/lucid/main/binary-amd64/Packages:
...
Package: libqt4-multimedia
Source: qt4-x11
Priority: optional
Section: libs
Installed-Size: 324
Maintainer: Kubuntu Developers <email address hidden>
Architecture: amd64
Version: 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6
Depends: libasound2 (>> 1.0.22), libc6 (>= 2.4), libgcc1 (>= 1:4.1.1), libqtcore4 (= 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6), libqtgui4 (= 4:4.7.0~beta2-0ubuntu3~lucid1~ppa6), libstdc++6 (>= 4.1.1)
Filename: pool/main/q/qt4-x11/libqt4-multimedia_4.7.0~beta2-0ubuntu3~lucid1~ppa6_amd64.deb
Size: 92628
MD5sum: bc931a227e93362e9ee15f0d4f4b44fa
SHA1: 7c5c286005d949dc3c90b06fc5f40ad8758cd8af
Description: Qt 4 Multimedia module
 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 The Qt Multimedia module provides low-level multimedia functionality.