/etc/apt/sources.list:
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deb http://xnv4.xandros.com/xs2.0/pkg xs2.0-xn main contrib non-free
deb http://xnv4.xandros.com/xs2.0/upkg-srv2 etch main contrib non-free
deb http://<user>:<password>@download.uib.de/debian xs2.0 opsi3.2
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apt-get install opsi4xandros