I recently tried to change my desktop background and find that I cannot do so in a way that survives rebooting. I can change it during a session, and all works as expected, but after a reboot I get the default theme background.

I tried changing the file /home/user/.osso/hildon-desktop/home-background.conf to point to the image I wanted, but that did not work either: after a reboot it was rewritten to still point at the default theme background.

There must be a way to do this. What am I missing?