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Previously in Karmic, we created a logout script that does some work in the background on backing up a users home directory, this script was put in the /etc/GDM/PostSession directory.

I can't figure out where to put a script that I want to run during a logout in LightDM.

I've searched and have found many people who are looking for this answer, so any help would be greatly appreciated.

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At least since Ubuntu 12.04 there is now an option session-cleanup-script which can be added to the [SeatDefaults] section of /etc/lightdm/lightdm.conf. /usr/share/doc/lightdm/lightdm.conf.gz is the documentation:

# session-cleanup-script = Script to run when quitting a user session (runs as root)

Do not forget chmod +x yourscript to give your script executing permission.

After changing a value in lightdm.conf it takes only effect after lightdm is restarted. You can either reboot or login to a console (Ctrl+Alt+F1) and run sudo restart lightdm.

(Thanks to Krytarik who posted this answer in

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If you add a cleanup script and log out, it won't work immediately. It seems as if you have to reboot first. – lumbric May 27 '12 at 19:26
You only have to restart lightdm. I'll edit my answer. – elmicha May 28 '12 at 8:26
Yeah I thought so, but I didn't think of that and tried 15 times to log out and in again. Fortunately I didn't delete my test script and after reboot (I had given up already) it worked... :) – lumbric May 28 '12 at 9:08


session-setup-script = Script to run when starting a user session (runs as root)

session-cleanup-script = Script to run when quitting a user session (runs as root)

in /etc/lightdm/lightdm.conf file.


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This is not possible. I think you need to follow bug in launcpad

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