This shouldn't be too hard, as the packages are in multiverse, but Ubuntugeek helps us on the way!
read it here
Once it downloads the packages and begins the installation, youll get a screen that contains the Sun Operating System Distributor License for Java and hit Enter to continue. Youll see a dialog that asks you if you agree with the DLJ license terms. Select Yes, and hit Enter; the JRE will finish installing.