how to customize gnome-screensaver on xfce desktop

Question

I'm running GalliumOS on a Chromebook with gnome-screensaver as my screen locker. I am hoping to customize the lock-screen background but am having difficulty figuring out how to change it. It currently displays a different background from both the splash screen and the desktop background. Oddly enough it is also different from the default background for a new user. The desktop environment is xfce4 so the full gnome-shell doesn't seem available and normal configuration editing seems to not be working.

I started digging around for configuration files for gnome-screensaver but can't figure out where they are saved. The best I could find in the $XDG_CONFIG_DIRS/xfce4/xfconf directory was the xfce4-desktop.xml file. Which set the image-path property of the xfce-desktop channel to a symbolic link which pointed to a file of the same image as the lock-screen background.

Unfortunately changing where the symlink pointed does not seem to change the background image rendered by gnome-screensaver.

I tried digging into the source code for gnome-screensaver to see how that is set up but I'm not making much headway on it. Any suggestions?

Solution

Gnome-screensaver does not hold config for wallpapers. It is maintained by gnome-shell. You can change wallpaper by command:

gsettings set org.gnome.desktop.screensaver picture-uri file:///path/to/image.jpg

If its doesn't change automatically, you can apply change by:

gconftool update

Comments

[Devin M]

So gsettings isn't installed on my machine and it doesn't install using apt-get (unable to locate package). Suggestions for how to get it?

[LiveWireBT]

It should be in libglib2.0-bin (I found the package name via manpages.ubuntu.com/manpages/xenial/en/man1/gsettings.1.html‌​). Side note: I modified my Gallium installations to use slock instead.