By the way, I did compare the checksum of the ISO that I am using with the MD5 provided by Univention, and they match, so it would seem that the ISO is not corrupt.
Further, I tried installing this under VirtualBox on Windows 7, with the same result: the installer gets to the part where it says something to the effect that it is getting ready to launch the initial configuration setup, then it starts Firefox fullscreen, but the only thing that it displays is the Univention logo.
I would really like to be able to try 4.0 soon. Should I file a bugzilla report on this? Surely I'm not the only one to have encountered it.
By the way, will the release candidate be available for download today as described in the roadmap?