Light-locker doesn't work under LTSP

[John Hupp]

Hi, all.

I find that screen locking doesn't work with Lubuntu + LTSP, because 
light-locker requires LightDM, and LTSP uses LDM instead of LightDM.

I recall that Lubuntu once used xscreensaver for screen locking, and I 
don't think it requires LightDM.  But I think replacing xscreensaver 
with light-locker solved one or more problems, and I don't recall what 
they were, except that I remember having to log in at 2 screens when 
resuming from sleep.

I note that lxlock will also work with a variety of screen lockers: 
light-locker, xscreensaver, gnome-screensaver, slock, xlock, i3lock and 
xdg-screensaver.

Can anyone say more about the history, or the virtues/vices of the other 
screen lockers?