session-cleanup-script not called

Question

Because of this Bug I needed to edit the session-cleanup-script config in /etc/lightdm/lightdm.conf.

As the same post suggests, adding session-cleanup-script=/etc/lightdm/lightdm.conf.d/cleanup.sh is enough.

But it never gets called. Why?

Answer 1

Thanks to this false bug report, which helped A LOT, the key is not to append

session-cleanup-script=/etc/lightdm/lightdm.conf.d/cleanup.sh

at the end of /etc/lightdm/lightdm.conf but to uncomment the #session-cleanup-script= line and add a value there, as position matters.

Good luck!

Answer 2

With lightdm 1.26.0 from Ubuntu LTS 18.04.3, where there is no /etc/lightdm/lightdm.conf anymore by default, I just created it. This worked for me

% cat /etc/lightdm/lightdm.conf
[SeatDefault]
session-cleanup-script=/path/to/executable/script

When looking at /usr/share/doc/lightdm/lightdm.conf.gz which elsewhere is described as a template for the configuration file, there is no [SeatDefault], but just [Seat:*]. But the latter did not work for me.