Hi,
how can I properly install lightdm on Nextcloudpi?
I installed it via apt-get and it also starts but when I enter the credentials I it just loads the login screen again.
Thanks
Hyper
Probably because you don’t have a desktop environment installed. LightDM is a DisplayManager, meaning without a desktop environment, it can’t do much.
Anyways, this has nothing to do with Nextcloud in general or NextcloudPi in particular, and honestly I wouldn’t recommend you to install random packages on your NextcloudPi server without knowing what they are doing. If you absolutely need a desktop environment on your server, I would recommend you to install a desktop distribution, and then install the Nextcloud Snap package or Nextcloud Pi via Docker on top of it.
Xserver is installed or do I need something additional?
I never actaully installed and configured a display manager manually. What is your goal? If you just want to install a desktop environment I recommend installing the respective meta package, and it will install and configure all the necessary dependencies for you. For KDE you could use kde-plasma-desktop, for GNOME you could use gnome or gnome-core, and so forth…
However, this has nothing to do with Nextcloud, and if you want to learn more about desktop environments on Debian, I suggest you start here: DesktopEnvironment - Debian Wiki
If you’re on Raspberry Pi OS this might help: Upgrade Raspberry Pi OS Lite to Desktop (PIXEL, KDE, …) – RaspberryTips
EDIT:
Also, if this somehow breaks your NCP installation, you’re most likely on your own, so I wouldn’t recommend doing this in the first place, except you know exactly what you are doing. 
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