Change lightdm background

Question

Seen similar question many times on AskUbuntu, but most answers was bout unity-helpers or gconf ...canonical... etc, so this actually doesn't seem to work.
The problem is that I decided to move to lightdm from gdm. Yep, it works,but I can't setup background image to it - always getting black bg color in exchange of picture.
My configs:

tempos@parmasse ~ $ cat /etc/lightdm/lightdm-gtk-greeter.conf 
#
# logo = Logo file to use, either an image absolute path, or a path relative to the greeter data directory
# background = Background file to use, either an image path or a color (e.g. #772953)
# theme-name = GTK+ theme to use
# icon-theme-name = Icon theme to use
# font-name = Font to use
# xft-antialias = Whether to antialias Xft fonts (true or false)
# xft-dpi = Resolution for Xft in dots per inch (e.g. 96)
# xft-hintstyle = What degree of hinting to use (hintnone, hintslight, hintmedium, or hintfull)
# xft-rgba = Type of subpixel antialiasing (none, rgb, bgr, vrgb or vbgr)
# show-language-selector (true or false)
#
[greeter]
#logo=
background=/usr/share/backgrounds/lightdm.jpg
#background=#772953
#theme-name=Adwaita
#icon-theme-name=gnome
#font-name=
#xft-antialias=
#xft-dpi=
#xft-hintstyle=
#xft-rgba=
show-language-selector=true

The file itself:

tempos@parmasse ~ $ ls -la /usr/share/backgrounds/lightdm.jpg
-rwxrwxrwx 1 root root 1362684 авг 14 12:36 /usr/share/backgrounds/lightdm.jpg

Solution

Thanks all.
Seems, that it was some bug - in lightdm itself (meening package-specific or some libraries) or, possibly, it was simply installed with some errors/bugs. I'm now trying to install many different things, like compiz, awesome, enlightenment, lightdm and others, so can't be sure.
The fact is today both lightdm and lightdm-gtk-greeter received updates, and this fixed background's problems even with original images and config.

Comments

[dsmsk80]

Does your image file has correct permissions? Try to copy it to the default directory /usr/share/backgrounds/.

[Constantine Kozlov]

@dsumsky As you can see below config, it's already in this directory and has 777 rights