There are many website already installed and working.
Also Owncloud is installed on the websever as a website and everything is working fine except uploading.
Always the error “Not enough space”.
There is about 750GB free diskspace and I accepted the default path settings.
Found the solution yesterday.
If you fresh installl owncloud the standard space should be set otherwise users with standard space do not have free space available. After setting the standard space (or set the availvable space per user) problem is solved.