It seems gconftool-2 from comment #2 is being deprecated. Here's how to fix this in 13.10:
dconf write /org/gnome/desktop/background/picture-options "'spanned'" -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/521492 Title: [Patch upstream] Dual Monitor wallpaper is not scaling across both monitors, same background is repeated on both monitors instead To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-control-center/+bug/521492/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
