[LightDM] lighttpd fails to start xfce4

[Branko]

Hi all.

I have a Gentoo system ( with systemd) on my Thinkpad, where I used to 
start Enlightenment .

Efter deinstalling it and installing Xfce4 I noticed that lightdm 
refuses to start.
I thought I was some session configuration file that I forgot to tweak, 
but after rechecking everything, I am still at a loss.

lightdm fails while manual start through "startxfce" works.

I checked te log file and it seems that it fails because it refuses to 
start a new session while inside another session.


When I login, logind seems to create new session and if I start lightdm 
within it, it fails. But it fails the same way even when started trough 
systemd's service script ( manually with "systemctl isolate 
graphical.target" - I haven't tried as using it for default boot target 
as it stuck in endless restart cycle, which requires reboot and messing 
around with bash to set default target to something that can be booted, 
like multi-user.target).

Here is a snippet from log:

[+2.39s] DEBUG: Activating ConsoleKit session 
21289a790e5a8c78988b60b354fb8020-1442847127.809317-280785761
[+2.39s] WARNING: Error activating ConsoleKit session: 
GDBus.Error:org.freedesktop.DBus.GLib.UnmappedError.CkVtMonitorError.Code0: 
Session is already active
[+2.65s] DEBUG: Session pid=13033: Greeter connected version=1.10.5
[+3.45s] DEBUG: Session pid=13033: Greeter closed communication channel
[+3.45s] DEBUG: Session pid=13033: Exited with return value 11
[+3.45s] DEBUG: Seat: Session stopped