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I have recently been trying to separate all three wallpaper states that are all the same as default. They are:

  1. Unity Greeter
  2. Lock screen
  3. Desktop

All of them have a wallpaper, and as default the three are all the same and changed by changing the desktop wallpaper. It is fairly simple to change the log in background in LightDM, but I haven't found any successful attempts to change the lock screen background and 'free' it from the consistent background setting.

I was looking around for a solution, and I got this:

sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.defaults --set /desktop/gnome/background/picture_filename --type string /path/to/image.jpg

But it just doesn't work. No errors, no notes - it simply does affect the settings at all. The file it edits exists, and it looks reasonably legitimate for the purpose - but it's ineffective.

How would you correct the command or diagnose the problem with it?

I am using Ubuntu 12.10 Quantal Quetzal and am running Unity (if that isn't already obvious).

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What version of Ubuntu? gconftool became sort of obsolete so this will not work anymore. – Rinzwind Feb 2 '13 at 11:18
12.10, sorry. I'll add that in. – Mochan Feb 2 '13 at 11:31
up vote 1 down vote accepted

This is only possible in Gnome 2. In newer versions, the background picture in the lockscreen will always be the same as the background of the user currently logged in.

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