Hello,
on a Windows server 2012R2 I have installed an Ubuntu 16.04 LTS virtual maschine (Hyper-V) with apache web server and nextcloud 13.
The system works but only with 1 user. If I add a second user, the second user can not reach the data´s. If I delete the first user, then the second user works without changing something.
Where can I adjust the amounts of users?
This doesn’t sound like an issue with Nextcloud in general. With a standard installation Nextcloud works out of the box with as many users as your server can handle.
I’m not sure if it is a misconfiguration of your server or an issue caused by Windows Server 2012 R2 or the Hyper-V.
Maybe you can describe your NC installation in more details, paste config files (please remove confidential content before pasting) and log files, please.