For those who hate ubuntu spatial and never want to see it again, you can issue this command WITHOUT any users logged into Gnome (GConf can’t be running.).
sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.defaults --type bool --set /apps/nautilus/preferences/no_ubuntu_spatial true
The same is true for other settings as well. Also, if you want to make a setting mandetory then just change “defaults” to “mandatory” and users will be restricted to that setting. For other settings you’d probably need to change the type after “–type” and the value at the end.