Hi,
first, please post logfiles and so on directly into the forum you can post them between two “triple-backtick-lines”: ``` So it is in the forum for later reference as pastebin entries will get lost later.
I do not see any error in the logs. How did you start installation? Could you try to do on command line? Use:
univention-app install kopano-core
Just as an idea: do you have a cdrom configured for apt somehow?
/CV