Bug#755359: [kdm] systemd seem to fail to start display-manager.service

[John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>]

Hello Franceso!

kdm is missing a systemd service file. I am not sure whether this is
related to your problem, but you could add the attached kdm.service
file and add it to /lib/systemd/system and see if that fixes your
problem.

Cheers,
Adrian

-- 
 .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz@debian.org
`. `'   Freie Universitaet Berlin - glaubitz@physik.fu-berlin.de
  `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913

[Unit]
Description=KDE Display Manager
Documentation=man:kdm(1)
After=systemd-user-sessions.service

[Service]
ExecStartPre=/bin/sh -c '[ "$(cat /etc/X11/default-display-manager 2>/dev/null)" = "/usr/sbin/kdm" ]'
ExecStart=/usr/sbin/kdm
Restart=always
BusName=org.freedesktop.DisplayManager