linux restricted modules gets built after the linux image, so is often later. if you've got packages held back in apt, which often happens while in development, it's probably that.
** Changed in: linux-source-2.6.20 (Ubuntu) Status: Needs Info => Rejected -- wireless driver ipw3945 stopped working from 2.6.20-9 up https://launchpad.net/bugs/92746 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs