I just did a clean install of Kubuntu 8.04 Alpha 5 and I can confirm the bug. Running gconftool -g /desktop/gnome/background/picture_filename returns:
No value set for `/desktop/gnome/background/picture_filename'
Executing gconftool -t str -s /desktop/gnome/background/picture_filename "$(dcop kdesktop KBackgroundIface currentWallpaper foo)" fixes it.
I just did a clean install of Kubuntu 8.04 Alpha 5 and I can confirm the bug. gnome/backgroun d/picture_ filename returns:
Running gconftool -g /desktop/
No value set for `/desktop/ gnome/backgroun d/picture_ filename'
Executing gconftool -t str -s /desktop/ gnome/backgroun d/picture_ filename "$(dcop kdesktop KBackgroundIface currentWallpaper foo)"
fixes it.