Let me make sure I am understanding what you are trying to change. I am thinking you (1)
are trying to change the desktop image behind the log-in chooser. You (2)
are not, at this time trying to change the grub2 splash screen -- the desktop behind the text on the page where you choose LinuxMint, LinuxMint Recovery, Memtest, and any other OS choices. You (3)
are not trying to change your wallpaper of the system once the desktop is up and running.
UNSUCCESSFUL ATTEMPT: I initially opened /etc/gdm3/greeter.gconf-defaults
as an administrative user -- I right clicked from within the Nautilus file manager and edited the file to point to a different image within /usr/share/backgrounds/linuxmint/. I rebooted and nothing had changed.
Here is a way to change the image behind the user log-in in the middle of the screen. This is not the correct or proper way to do this. It worked for me.
SUCCESSFUL: I first changed the name of the image file pointed to in the first line of /etc/gdm3/greeter.gconf-defaults
which for me was actually a link to a file in another folder. I used this command
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sudo mv /usr/share/backgrounds/linuxmint/default_background.jpg /usr/share/backgrounds/linuxmint/default_backgroundbak.jpg
I then copied another wallpaper into the directory and gave it the name of the file which was pointed to by /etc/gdm3/greeter.gconf-defaults
. I used one of the other wallpapers which came with Mint 10, but one I had never used for anything.
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sudo cp /usr/share/backgrounds/linuxmint-julia/treeish-dark.jpg /usr/share/backgrounds/linuxmint/default_background.jpg
I then rebooted and the image had changed to the one I had copied into the directory. The change has held through several reboots. A definite shortcoming of this method for me is that I may not be able to use a image of another file format; such as a .png, .bmp, or .svg file. In a bit I will attempt to open /etc/gdm3/greeter.gconf-defaults
using the command line gksudo gedit
. I'll report back.