I cant login after i installed opsi.
Only root login works.
The other logins doesnt work.
If you are root you might be able to check the logs.
I’d start to look in the /var/log/univention directory.
In addition it would be helpful to be a bit more specific, for example you could at least describe where you are trying to log in and the exact error message. We can guess but sometimes guesswork is wasted time.