No possible to install owncloud

I have the same problem as with all installs I did:
First time i can log in with the selecte admin user but second time it seems that ladp conf is not properly set and it is no more possible to log in with any user, except the one created at install and called admin. the only issue is that the admin password is unknown.
unless you read the log but the logs is only visible for a short period of time after which its over you just need to reinstall again.
It would be better if at install the admin password was used for the admin user.