Installation Owncloud 9.1.0 impossible

Don't hijack this thread and open a new one. Your problem is not related to the OP at all!

The issues seems to be that user root has too much permissions. the work around is to create oc_admin manually and give it only access to manually created owncloud databse , so the setup just takes it and uses it .
see https://forum.owncloud.org/viewtopic.php?t=4593