Final case: The debugging of this state closed. No solution found with those machines in testing. I ended up with a fully new hardware architecture, a lot newer machine. Fully reinstall again, now on Ubuntu 14.04.2 LTS, 64bit. Fun fact, issue never again happened. Maybe candid camera was removed from room… damn, it was a bit frustrating haveing such insane malfunction with a normally working software. A week passed by, no issue anymore. Strange.

Thx for replies and tries in helping!

I know that I disappeared a bit with this issue, but as I wanted to make a reproducable version of this problem I created many virtual box instances to make a closer look on the problem. And now, for reason unknown, I cannot reproduce the issue. Hosts are created as I want them to be, etc. Really, really dont get the problem, what happened. If I again can reproduce the issue maybe I will be aware of the reasons.