There have been many issues reported concerning Light Locker. Sometimes the lock doesn't work, it locks by itself when not supposed to and many more. Bottom line is Light Locker's major issue is, it doesn't hold the applied or user settings after a reboot or log out.
Tried many workarounds to no avail. The way I solved this issue was by removing Light-Locker completely and installing gnome screensaver.
Replace Light-Locker with Gnome Screensaver:
- Start Synaptic Package Manager.
light-locker, then uncheck
light-locker-settingsand click [Apply changes].
- Then type
gnome-screensaverand check the box to the left and click apply changes again.
Or, using the terminal:
sudo apt-get remove --purge light-locker sudo apt-get install gnome-screensaver
It works perfectly, didn't mess up my configuration with
lightdm, and looks good too. If you're not satisfied with the background shown every time you lock your screen, you can install
gnome-tweak-tool. If you can't find it in the applications menu, you can either run it through terminal
gnome-tweak-tool or or create a launcher using the same command. Once it's open go to the desktop tab, and choose the location of the background of your liking.
Now you can lock your screen and enjoy a nice screensaver/locking application that works! Good luck! :)