Skolelinux installation fails

[4richters@directbox.com]

Hi,
I've tried to install Skolelinux (debian-edu-7.1+edu0-CD.iso) several times during the previous week, but it failed again and again at the same point.

First, I thought maybe the missing opportunity to enter our school's proxy setting was the reason (by the way - how can a proxy server be specified during installation - all the traffic has to go via 192.168.117.2:8080 in my case???).

So I tried at home with no proxy in between - same result: "Some required packages failed to install. The packages were education-tasks." See attached screenshots.
The same thing happens with the German version.

It's really frustrating. What is wrong?

Greetings from Germany!

Attachment: Fail EN 2014-03-26 um 10.45.17.png
Description: Fail EN 2014-03-26 um 10.45.17.png

Attachment: Fail DE 2014-03-24 um 08.17.27.png
Description: Fail DE 2014-03-24 um 08.17.27.png