force sceensaver lock when hibernating on ubuntu

You can use a program called gconf-editor to directly change various settings. It's kind of like Windows' registry editor. Press Alt+F2 to get the run dialog, and type gconf-editor and hit enter. Browse the tree to /apps/gnome-power-manager/lock/ and poke around at the settings there until you get the behavior you want. You'll probably want to uncheck use_screensaver_settings.