used the " [How To] Unlock Bootloader & Root Galaxy Nexus" but got no root

I am running Jellybean and tried this method, the bootloader unlocked but I dont seem to have root access. I have the super user app but the version it says i have is 3.0.3 and version 3.0.3.2 is the latest version. busybox will not install and root access fails. Can anyone please help.

sounds like you need to flash an updated su package.... the typical ics su package doesn't work for jb... i know there's a thread with it at xda.. but i don't have a link on me