Install rt-linux kernel in Ubuntu 11.04

hi... i m facing some problems in installing rt-linux kernel in ubuntu 11.04... i tried once i was able to make compile, n make the image of the kernel, copied to the usr/src folder... tried to configure the GRUB bt didnt get any luck... it will be really helpfull if someone can give me a step by step guide.. i havent use ubuntu or linux brfore... this is my first time...