It is disappointing that nobody could answer this question.
By the way, the end of the song was, that I left this virtual machine, at the provider "Host Europe" and moved to another provider, netcup, with another virtualisation system, KVM. This was a lot of work, like usual, when I had to move a productive server to another.
At least I could change to a cheaper product and had even more power (but less HDD), so it was not too bad the change.