Backup2master hangs forever

Hi there, I use a UCS backup instance (4.4-9) that is prepared to become a master. It is setup in a virtual machine. When I try to

/usr/lib/univention-ldap/univention-backup2master

the last log entries are:

The following NEW packages will be installed:
  univention-server-master

And there it hangs forever. I built new Backup instances from scratch to see if the problem is the same on fresh installations and yes it is.

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