If you are using Hardy Server or any other older versions of Ubuntu Server, and you want to upgrade to Intrepid Server or any other future latest Ubuntu Server releases, here are the simple steps...
But before that, please take note that upgrade will not take place by default because 8.10 is not a Long Term Support (LTS) release.
Very important, be sure that you have all updates applied to Ubuntu 8.04 LTS before you upgrade to 8.10.
Here are now the steps:
sudo apt-get install update-manager-core
Edit /etc/update-manager/release-upgrades and set:
Start now the upgrade:
Just follow the on-screen instructions and have fun :)