I can't disable screen lock in Lubuntu. In Power management I have it unchecked. There is another option "Enable light locker" in the "Light locker settings". I also have this unchecked but I still see black screen after 10 minutes and when I move the mouse I have to provide a password.

I hate this behaviour in all ubuntus, but usually I can just disable it in system settings. Well not here.

So lubuntu has these settings in two places and is ignoring both.

I found this question:

[Stop Xscreensaver from locking screen once screensaver starts](https://askubuntu.com/questions/130808/stop-xscreensaver-from-locking-screen-once-screensaver-starts)

According to this, I tried to remove "xscreensaver" package, but didn't have it installed at all. So this solves 

**EDIT:**

What I learned so far:

* this is not magic. it affects other people as well
* it is caused by a bug in Xfce power manager:

<https://bugs.launchpad.net/ubuntu/+source/xfce4-power-manager/+bug/1193716>