Hi' I have installed Ubuntu 8.4 and now the latest is 8.4.1- I want to know whether my system as already been updated to 8.4.1, although I initially installed 8.4 as I have taken updates on daily basis. Thanks Kithsiri

If you are updating regularly, you should have the latest version. You can check the /etc/issue file to verify. There is no special "service pack" or anything to install, 8.4.1 is just a "roll-up" of all the software updates since 8.4.0.