[winswitch] Winswitch Installation issue on Debian

[Office]

Hello,

maybe someone could help me to get me on the right track:

I'm trying to install Winswitch on Debian Wheezy, which I did before on 
other machine, but it fails on this machine. I'm always getting this error:

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The following packages have unmet dependencies:
  winswitch : Depends: xpra (>= 0.3.0) but it is not going to be installed
              Recommends: nxagent but it is not installable
E: Unable to correct problems, you have held broken packages.
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I'm using the standard debian repository installation as before.

Thanks,
Karl