I have Kubuntu 18.10 in which I installed XFCE.

I wanted to use xdm as my display manager. So i installed it and I activated it using `sudo dpkg-reconfigure xdm" and selecting xdm as my display manager.

But every time I reboot I am redirected to a black screen. I am able to do CTRL+ALT+F1, login as root in the terminal and restore LightDM, then reboot and gain access to a login screen.

What could be the problem? What debug information I need to provide? drivers

I have the NVIDIA proprietary driver

Here is the Ubuntu version:

lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 18.10
Release:    18.10
Codename:    cosmic

and the Linux kernel version

uname -a
Linux raffa-kubuntu 4.18.0-13-generic #14-Ubuntu SMP Wed Dec 5 09:04:24 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

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